There’s also an instinct for preemptively defending and discarding any piece of criticism and attacking those with criticisms (no matter what it is) of being invalid.
The reason definitely isn’t because GIMP is a great piece of software with a logical UI, near a random UI filled with aging cruft, tutorials from 2004, and bizarre flows for doing simple things. Any affection for the GIMP is Stockholm Syndrome from spending 8 hours a day in it and getting periodic dopamine hits from puzzling out a riddle of how to do something in it that seemed like it would be simple.
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Look, I respect and am appreciative of the work the GIMP team and community does. It's impressive and I've donated to them over the years, even though I have never enjoyed using the software. And Photoshop these days is often a mess, I'm not defending that.
But it is possible to appreciate that the GIMP exists and also be critical of its abysmal usability and the fact that it pales in comparison to not just other proprietary (but extremely affordable tools like Pixelmator, Affinity Photo, Acorn), but also other FOSS tools like Krita, Blender, and Inkscape, to say nothing of near-OSS tools like the excellent Paint.net. Some of this is down to the fact that making good software is hard, especially free software. But a lot of it comes down to a lack of solid direction and and insistence from the crowd that GIMP is every bit as good as Photoshop. It isn't. It never will be.
I'm glad the GIMP exists. You also couldn't pay me to use the GIMP.