The first three character classes to appear in D&D were the Fighting-Man (now called the fighter), Magic-User (now called the wizard) and Cleric. The first supplement introduced Thief (now called Rogue) and Paladin (as a Fighter sub class). The list grew a bit with f.e. druid and ranger but then with adnd 2e it was re-organized again with all character classes falling under the four traditional abstract archetypes: Warrior, Wizard, Priest, and Rogue.

So it came from the humble beginnings I’d say. It also makes the game more fun when you have your own specialty. Having two bards argue about who’s the better one at haggling does sound like a fun rp opportunity though.

With GIMP 3.0 it’s a bit better at least, they’ve finally added non-destructive editing:
https://www.youtube.com/watch?v=qfaq-Cm1ZkA

Full changelog here:
https://www.gimp.org/release-notes/gimp-3.0.html

I’d dare say that unless you’ve already learnt Photoshop (and have to unlearn it) then Darktable+GIMP works fine for home photo editing.
If you’re used to Photoshop and your skills with it is what puts bread on the table… then I completely understand not switching tools.