Galaxy forcefully imports offline installed games and adds/changes files even if you have auto-updates disabled, taking away my control of my files. I want to use Galaxy for games like No Man's Sky, but Galaxy will also break modded games like Saints Row 2 by "updating". Not to mention, I never gave Galaxy permission to edit these games. If I wanted to have access to the game through GOG Galaxy I would use Galaxy to install the game.

Galaxy importing offline installed games needs to be an OPTION not something automatically done by Galaxy.