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GIMP is ...not very good. Fixing the UI and UX wouldn't change that. Compared to GIMP, as a project, Krita is in another dimension.

If any software is going to become a successful FLOSS Photoshop replacement it's either Krita (if they decide to go that route instead of just painting) in a few years, a new open source project with an impressive MVP (like Olive the video editor, to Adobe Premiere), or some kind of miracle like one of their commercial competitors deciding to open source it.