FWIW, GIMP has been installed on every single educational computer I've interacted with from pre-elementary school to college, in both French (Québec, France, Morocco), Arabic (Morocco) and English (Québec) schooling systems.
― Albert Einstein
"It's just common sense" is simply an excuse to stop thinking, be it about the characteristics of the natural world, (which is, I think, what Einstein was getting at), or about human behaviour and characteristics. Things called "common sense" may even make good sense. So think about them and make the relevant case. Things called "common sense" are also often really just plain nonsense when dragged out into the light of proper critical analysis based on solid evidence.
Common sense is also the good sense that should be expected of the common man.
Cloning Photoshop, poorly or otherwise, has nothing to do with GIMP.
But nowadays where it has to be used across so many schools because its the only application they can afford I do think it was inappropriate and should have been changed.
Then again I think a better future is possible for image editing, cloning Photoshop poorly isn't the only solution to the problem.