There’s an existing feature request related to this here:
https://forum.inaturalist.org/t/increase-max-image-size-from-2048-x-2048-pixels/13627
which seems like it would be a good place for this discussion, since many of the issues likely to be brought up are laid out there. @invertebratist is there a strong reason to leave this as a separate thread?
You could also consider working this up as a full feature request and submitting.
Another related discussion is
https://forum.inaturalist.org/t/photo-size-and-quality-when-re-downloading-images/5594
And there may be more.