the game files are just getting larger with each patch and expansion.
Shadowbringers is just around the corner and i would hate to spend the time i paid on my sub to reinstall the whole game again.
Also making a copy of the games install folder is just too data consuming for some if not most.
if there is any corrupt data in a reinstall, i would need to uninstall and reinstall all over again, we really do need a file checker in the launcher if the game size continues to grow.