Aren't many of us programmers? Don't we gain something from reading source code in languages we might be interested in using?

It does actually a lot - I know that when I contribute to this project I have a much lower probability of shooting myself in the foot compared to most of the other languages

We are craftspeople. Of course we care about how tools are made. Else we'd be at ProductHunt.

That's not true! See other comments in this thread.