My solution was to stop playing Sims until EA fixes this. I won't disable operating system functionality I actually want and need just for one game.
@vladnc Well, sure, that would do it. But EA is not going to "fix" anything. The Sims 4 user folder has always been in Documents, the Sims 3 folder is there, the Sims 5 folder will probably be there, and so are the user folders for many other games, both made by EA and not. It's pretty standard practice now to place user files in Documents, where they're easily acccessible to the player, rather than burying them in program files or AppData. There's nothing to indicate that this practice will change any time soon.
If Windows is going to sync Documents by default, you're going to have this conflict, that's all there is to it.
@puzzlezaddict Indeed. What makes Sims 4 different is it doesn't store just user files there. It stores hundreds of temporary files there as well. That's the bug. There is a dedicated folder for temporary files, and it's not under the user documents folder.
Later edit: but I have to agree with you on one point: EA won't fix anything. They just don't care that their software is bad. The thing is, life is too short to waste it fighting with incompetent software companies. It's not worth it. In conclusion, if you don't have a dedicated computer for this game, you shouldn't buy it or any of its content.
