Earlier quoted context omitted.
"Arguably" in the sense that you just decided to claim something that has no relation to reality? Like Ghostbusters 2 was "arguably" the highest grossing movie ever made in Albania by a crew of chipmunks? Gimp starts off as an emergency last minute replacement project for two undergrads at Berkeley that does basically the same thing as Photoshop. It wasn't ever anything like Microsoft's Paint.
I am not sure why of all my entire comment you decided to lash at a single word. My argument still stays, gimp never was and still nowhere is near the Photoshop level. Krita excels both as painting and photo tool.
Old Photoshop from that era defaults to a single RGB layer. To turn it into an RGBA layer (e.g. for drawing objects with a transparent background) you need to rename the layer. Not very intuitive but Photoshop users learned to do it. In early Gimp 0.x releases how do you turn the initial single RGB layer into an RGBA layer? You rename it. This is not a coincidence.
In contrast in mspaint there are no layers, there is no RGBA mode.