Sliding Doors Should Only Be Half-Tile Wide

I agree!
If nothing else, sliding doors shouldn't block the whole tile on the floor in front/behind it.

Another similar thing is space for bathrooms; like tiny bathrooms in tiny houses or trailers, where the toilet is literally right in front of the toilet!
(I have not been here long enough to find the post for that, I do my searches as I come across problems with sims 4...there have been many.)