Their point is that the files shouldn’t be there in their home directory in the first place. Your approach would still leave symlinks/junctions in their homedir

Their point is that the files shouldn’t be there in their home directory in the first place. Your approach would still leave symlinks/junctions in their homedir. Their proposed driver-based approach would allow apps to think they’re writing to your homedir when they’re actually writing under appdata, leaving the homedir clean.