As annoying as it is being set this way by default, it's easily avoided by right clicking on the user folder to move ( documents|desktop|video|etc) folders in File Explorer -> Properties -> Location tab.
Then either: Type in: C:\users[your current user]\Documents (or which ever user folder being changed)
Or
Click Move and browse to and select the local folder you want to use.
Click apply, it will ask you if you want to move contents from the original location as well.
Click yes, and now your user folders will be and will stay local. I haven't had any issues since and have had that set for years on my windows PCs.