Spiral Staircases

I think the main challenge with spiral staircases in TS4 is accommodating varying wall heights. So far, all the stairs in TS4 work for varying heights (including foundations and slopes), so spiral staircases might have to be a special case that only works for the 3 wall heights. And even then, the devs have to think about what happens to existing spiral staircases if you change the wall height, because the top landing might change its direction in that situation (e.g. the landing faces north with short walls, but when the spiral is extended for tall walls, it might end up facing east)

TS3 has a lot of similarities to TS2, so I'm guessing that's why TS3 got them very early on in its lifespan

That said, I'd also love to have them in my game. Any additional options for my sims to live in beautiful houses are appreciated :)