I guess it would have made more sense for me to say "Python C extension developers".

I don't find multithreading in languages without particular support easy at all, but I have become better at it. It is possible and sometimes necessary. It seems like the prevailing attitude in the Python ecosystem is weird, a kind of sour grapes thing, i.e. "Python doesn't have good multithreading support, but multithreading is ugly and error-prone anyway and the alternatives are almost as good or better".