Re: Forget the geeky stuff, sort out the user experience.
It's not so much that it's complicated. It's that there so many things it does slightly different than everything else. Each of these things are, by themselves, merely mild irritations. But in the mass...
Things like that it shows layer boundaries by default (no other graphics program I use does. Affinity Photo shows them context sensitive when needed.), and cannot remember that I turned it off (it remembers all other kinds of shit from last session. Why not this one?). Things like selection fields do not just show the options when I click on the little down arrow – I have to click AND HOLD, contrary to everywhere else on the system. Then there's the file explorer it has for "File Open" it has in it that behaves totally different (not even bad. Just different enough that I loose orientation. I click on the top folder on the sidebar, and it does not show me the contents of said top folder. It goes to a sub folder three layers deep where I was last time.) [These last two are probably connected to the fact that they do not properly port, just cross-compile.]
And so on.