Gimp is garbage bro. A window for each tool? That your WM manages? Okay where is that tools window or layers window or what if I’m editing 20 icons and one of my icons was covered by a browser window. At least old photoshop would remember z order and bring them to the surface and keep tools on top. Gimp May have fixed this one issue but it’s an example of why paid UX design wins 99 times out of 10