Regarding Python: Really? Obviously v2-to-v3 was an absolute fiasco, but since then, it's been great in my personal experience.
Don't get me wrong: Python hasn't overcome its tooling problem, so there's still that barrier. But once your team agrees on a standardized tool set, you should be able to coast A-OK.
Every time there's a 0.1 Python version increase, it takes months for other libraries to catch up. I still have to install conda envs with Python=3.9 because they are warm-blooded software.
Don't get me wrong: Python hasn't overcome its tooling problem, so there's still that barrier. But once your team agrees on a standardized tool set, you should be able to coast A-OK.