Gimp is good. I don't know what the gimp haters are always so mad about. The buttons are in different places than in photoshop, big whoop. I have been able to do everything I've ever attempted in gimp and I do modding and game development. I just don't get it.
You have to use a plugin to even draw a circle properly.
You can't make non-destructive changes to things like filtered elements e.g. make blurred/outlined/etc. text and then change the text.
Content-aware functions
big whoop
Just how different it is from Photoshop is literally the biggest complaint people have. And that it's just unintuitive to many even if you never used photoshop. For gimp to propel in popularity I think it has to become more familiar to what professionals are used to.
I will say this till the day I die: Krita is better than GIMP in basically every way and can even integrate with graphicmagick for its filters via a plugin (which comes built-in for the flatpak version).
The UX is so close to photoshop to the point where it makes no sense to use GIMP and endure the suffering of its UI.