They enjoy being portable and like things to stay that way so when they introduce a new toolchain dependency which will make it harder for some people to compile git, they point it out in their change log?

I don't think "NonStop" is a good gauge of portability.

But, I wasn't arguing against noting changes in a changelog, I'm arguing against putting portability to abstruse platforms before quality.

I don’t think staying portable means you have to do concession on quality. That merely limit your ability to introduce less portable dependancies.

But even then Git doesn’t mind losing some plateformes when they want to move forward on something.

Git's main concern should, of course, be getting Rust in, in some shape or form.