Microsoft's OneDrive cloud storage service is installed on your PC by default, and it can cause some trouble when playing PC games on multiple devices.
They use Documents because it’s an easy way to ensure saves don’t persist between users. If you and a sibling both play on the same computer, you don’t necessarily want to be sharing game saves. Since the Documents folder is on a per-user basis, the saves are per-user as well. If they simply saved the games in the Program Files folder, saves would potentially persist across users. And anyone who has had a younger sibling accidentally erase all of their saves knows what a bad idea that is.
They use Documents because it’s an easy way to ensure saves don’t persist between users. If you and a sibling both play on the same computer, you don’t necessarily want to be sharing game saves. Since the Documents folder is on a per-user basis, the saves are per-user as well. If they simply saved the games in the Program Files folder, saves would potentially persist across users. And anyone who has had a younger sibling accidentally erase all of their saves knows what a bad idea that is.
Make it a new personal folder called “Games”.
Not the first time MS fiddled with those settings lately.