Now, every two releases they add a "language feature". Some library maintainers jump in the bandwagon, and WOOSH! : half the ecosystem depends on CPython to run. Bye Jython, Cython, PyPy, Micropython, etc and bye the code analysis and code transformation tools : all outdated until more funds or voluntary dev are willing to fix them

In an ideal world, the community should fork Python 2.7, rename it and add type hints. But that's too late, all the dev time was spent on making libraries compatible only with some recent versions of CPython