> So in more sensible ecosystems you will have, e.g., Gemfile and Gemfile.lock. pip freeze is, effectively, the way you create Gemfile.lock, but it forces you to destroy Gemfile to do it.

No, it doesn't.

  pip freeze -r requirements.txt > requirements.lock.txt

There's plenty of legitimate criticism of python in general and pip in particular, but much of yours send to be criticism of things that are factually untrue.