I didn't mean to sound condescending, and if I hurt any gimp devs, I'd like to apologise.
I... Partially agree with you that every UX is "engineered" but that depends on how far we're willing to stretch that definition in the design domain.
I'd hardly call any workflow I design an engineered one (even if I like this field), when compared to something produced by an UX designer (or a team of them) who specialises in the field. Maybe someone put a lot of thought into the gimp UX, but it seems like a wasted effort (or maybe it was just inexperience). I don't know how to phrase this without it sounding insensitive, though. I'm not criticising the people, just this instance of their work, so I hope it inspires them to improve. I'd like to see Gimp become as successful as krita or inkscape (which had UX issues for years, too)
I realise gimp is free, but there also seems to be a general attitude amongst gimp contributors that they think the UX is fine, while most people (in my circles, at least) disagree with that view