I wholeheartedly disagree with the sentiment in your comment. Just because you, or a certain group of people don't like it, doesn't mean it's a bad tool. It may not serve for everyone, but for those for which it does, it works, and it does so well. Also, acting like photoshop is the be-all end-all of photo editing pushes the idea that you must be just like photoshop to even compete, which is actively harmful as it prevents people from innovating, and puts pressure on anyone thinking of even attempting such a daunting task.

Furthermore, even if I were to agree, your argument completely falls apart with the existence of Krita. Writing software like this is hard and time-consuming, which is the primary reason we haven't seen more projects of this scale, as there's been various smaller-scale tools over the years, like Pinta.