I tried ;) GIMP developers aren't very open to external contributions. I don't consider my attempts to be of low quality either, but the bike shedding resulted in them never being accepted. "It's best to wait until X lands" or "I think this will be part of Y".

Meanwhile, 10 years later, the functional features I've tried to contribute are still not possible in GIMP ;)

Yeah, I was mostly being facetious haha. I know that GIMP as a project is notoriously difficult to contribute to.

If someone actually has the ability to do instead of just complain, the answer is to fork it and welcome more patches.

https://en.wikipedia.org/wiki/GIMP#Forks_and_derivatives There might be one already, of course.