While i tend to post updates to older pictures on bsky, i feel like it would just be a lot of clutter on FA, even with the ability to move things to Scraps.
not to mention how tedious posting can be sometimes, being forced to do it one at a time.
It's not really noticeable or eye catching this way, but try looking over my gallery again. you may notice some of the pic's source files have been updated ;3
(or just go to my bsky and check the media tab i guess :p)