I have been using Gimp easily for 10 years now and Inkscape for at least 5, I know them decently well, and I appreciate they at all exist and the hard work that went into at all implementing the individual features. But the UX is terrible and this is objectively so, just sit a new computer user in front of Gimp and watch his agony when trying to use it. The open source "bazaar" model of software development in general isn't the best at coming up with good interfaces, you need a coherent vision of a single person with some authority for that.