I’m about to quit building.

I build sometime. If I don't have any inspiration to build, I'll stop & come to it later on once I feel inspired. But yeah, the clipping is a little bit annoying. Perhaps, you might want to build just rooms (there's a room challenge on this forum) to get inspired & play around with the BB?

I only have trouble with roofs and stairs. Sometimes I can "fool" the system with stairs, but no luck with roofs. If it's gonna clip through a wall or another roof piece, it will.

I agree that build mode has its limitations.
As for roofs clipping, there are almost always solutions for that. Using the arrows to trim eaves and adjusting the curve of the roof help a lot. And advanced roof mode can also help.
I recently learned that if you hold shift while applying a frieze, it'll only apply to a single wall instead of the entire room. That fixed a lot of issues for me.
As for the open stairs bug, that desperately needs to be fixed. The only existing workaround isn't exactly great due to the way build mode deals with "rooms".
And platforms are an absolute pain to build. Unless you keep reloading the lot, you'll end up being unable to build anything. Those need some serious tweaking. That said, fewer platforms mean better performance in live mode because routing doesn't work great with many platforms either.

Edit: here's a tutorial I wrote (ages ago) on building dormer windows without clipping. As far as I know it still works. https://mdianasims.tumblr.com/post/161657272445/how-to-build-dormers-without-roofs-clipping
I also have a tutorial about skylights on my blog.

Most issues I have with columns, I really wish they would be freed from the grid and could be resize, to made them a little bit bigger. The rest? sometimes, yes, they can be annoying. The decorations are my second issue, because most of them are either to big or to small (but occupied two slots) or simple not from my culture or taste, a year ago I was against cc, now my mod folder grows bigger from week to week. I have almost cried when I have found simple and straight white curtains.

idk i find frieze thing been problem for a long long time cause i remember already having that issue in vlads house when i still had his house which well..... its been very long time since i replaced it with my own mansion

for frieze and roofs it really depends if game recognizes room

and well... thats sort of bugged because i keep getting rooms where ive combined 2 rooms deleting wall between them but game still thinks its 2 rooms and i have to either leave it be like that or basically rebuild whole room cause it only goes away if i drag the room and siiiigh....

for stairs ive only had them bugged when coupled with platforms which well... are pure chaos at times but there is builds where they work so idk i feel it just depends how platform is used

like for example i absolutely hate one of those vacation houses in snowy because its so complicated for sims to route with constant up down one steps

but i have few apartments where platforms work just fine no routing problem in sight

The only irritating build-related bug I have noticed in the past few months is that some of my builds that feature elaborate stairs or just regular stairs do not work. At first, I couldn't figure why my Sims wouldn't go to another floor. I finally had to add some awkwardly positioned ladders that look ridiculous in those builds. But it's the only thing helps the Sims become unstuck and able to sleep in their bedrooms, lol. Aside from that, spiral staircases would also be a nice addition in a future patch. Provided they work, of course.

"MsKatieRose;c-17828318" wrote:
The only irritating build-related bug I have noticed in the past few months is that some of my builds that feature elaborate stairs or just regular stairs do not work. At first, I couldn't figure why my Sims wouldn't go to another floor. I finally had to add some awkwardly positioned ladders that look ridiculous in those builds. But it's the only thing helps the Sims become unstuck and able to sleep in their bedrooms, lol. Aside from that, spiral staircases would also be a nice addition in a future patch. Provided they work, of course.

So much yes here. I want spiral stairs more than anything. Of course, they’d have to make three sizes to accommodate all wall heights. Stretching one won’t work because the incline from step to step would increase and they’d need three animations. They can’t just “keep spiraling “ either because different heights would end up having different end points. I hope they figure it out though.

"Simmerville;c-17828416" wrote:
I had problems with stairs being blocked, but it was easily solved by removing a small part of the upstairs fence. Luckily no sim will ever fall down through that gap, anyway...

I have mostly problems with roofing, and it is likely caused by the platforms. Even if I recover the entire building with just one big roof piece, they get freezing temperatures in the hall way, as if the roof is not 100% covering the room. Visually I can't tell a difference. The stair rail has snow on it, but not the steps, and it will be mostly a visual problem during Winter, only.

I think you need to make sure your rooms have ceilings too, not just roofs. Platforms are rooms.

"MDianaSims;c-17828276" wrote:
I agree that build mode has its limitations.
As for roofs clipping, there are almost always solutions for that. Using the arrows to trim eaves and adjusting the curve of the roof help a lot. And advanced roof mode can also help.
I recently learned that if you hold shift while applying a frieze, it'll only apply to a single wall instead of the entire room. That fixed a lot of issues for me.
As for the open stairs bug, that desperately needs to be fixed. The only existing workaround isn't exactly great due to the way build mode deals with "rooms".
And platforms are an absolute pain to build. Unless you keep reloading the lot, you'll end up being unable to build anything. Those need some serious tweaking. That said, fewer platforms mean better performance in live mode because routing doesn't work great with many platforms either.

Edit: here's a tutorial I wrote (ages ago) on building dormer windows without clipping. As far as I know it still works. https://mdianasims.tumblr.com/post/161657272445/how-to-build-dormers-without-roofs-clipping
I also have a tutorial about skylights on my blog.

Interestingly, the shift-frieze tip is in my signature. Lol. Yeah, I know most of the tricks now, but some things just aren’t doable given a particular floor plan. I have a lot of plans that call for railings, columns, stacked stairs with open banisters, open floors, and other things. Sometimes I get lucky and can work things so all the offending areas are centralized in the plan and avoid these issues, but too many times I’ve had to abandon the better plans.

I had problems with stairs being blocked, but it was easily solved by removing a small part of the upstairs fence. Luckily no sim will ever fall down through that gap, anyway...

I have mostly problems with roofing, and it is likely caused by the platforms. Even if I recover the entire building with just one big roof piece, they get freezing temperatures in the hall way, as if the roof is not 100% covering the room. Visually I can't tell a difference. The stair rail has snow on it, but not the steps, and it will be mostly a visual problem during Winter, only.