[Kednicma]

To add some substance, I used to have PyPy commit ability. I also have contributed almost no code to PyPy. This isn't for lack of wanting; my project has produced several interesting RPython modules which could plausibly be shared with other folks. It's because PyPy's core contributors, the dozen or so post-academic compiler engineers, are incredibly prolific and skilled compared to the rest of the contributor base. They outproduce me. Compare: One person implemented PyPy's massive-subset-of-Python typechecker, one person produced Nuitka's broken typechecker, and a small community team produced MyPy's conservative typechecker. The PyPy version's by far the best, including translation to C and a JIT generator and allowing nearly any sort of codegen to a high-level GC'd Java-like data model.

The tragedy is that the Python ecosystem broadly doesn't use PyPy and doesn't contribute much to it, neither code nor cash. Our compiler engineers are just as good as the folks working on CPython (and there's some overlap), but don't enjoy the powerful deep-pocketed corporate support.