Additional software is needed for photo prints (color management and stuff like that) and (maybe?) scanning. I didn't try scanning without additional software, as I installed it with the photo print software. And since that software inly works under Windows anyway, I never bothered with scanning under Linux.
Printing works just fine so.
(Seriously, GNOME, whether to scan one side or two sides is actually important and the desired mode changes all the time. Would it kill you to dedicate some screen real estate to it, instead of filling everything with empty post-modern white space?)