I mean that the app Shutter doesn’t talk to whatever API Sailfish officially uses to control cameras, Shutter directly talks to the camera using “libcamera”.
Making “just take photos” work doesn’t require fixing the whole camera system in SailfishOS (as an example, see the work mentionned in today’s community in updating SailfishOS to the newer Camera2 API as exposed by the Android drivers that libhybris uses on smartphones like Xperia 10iii), it “merely” requires fixing a couple of stuff inside Shutter.