Originally posted by Elizabeth The Frog:

with the terrible building system, why even have building at all? like, cant build 3 inches from a pillar without my entire roof caving in, Oh lemme just use some actual support methods, oh none of them work, like? what the actual ♥♥♥♥?

Simply put, you've just not learned how to properly build in the game. That's a user end issue not a flaw with the game since the devs intentionally implemented it this way.

I recommend(as others) for your to watch building videos and read various guides to better understand the mechanics.