Another thing, he confirms something I was worried about, in his comments on parallelism / Python without the Global Interpreter Lock (aka GIL): Some developments in the language serve rather the big companies, than the community and open source projects. For example, lock-less multi-threading in Python serves mostly the largest companies, while having little value for small projects.

Absolutely agree. The significance of the GIL is heavily overstated in my opinion. There's a narrow set of use-cases where it matters, ie. if you must use threads and something like multiprocessing or a message queue (ie. Celery) doesn't do what you need. These are pretty rare circumstances, from my experience at least.