So I have to upload files to enable syntax highlighting. There is probably a reason but the users frustration is helping them to look for alternatives.
I think main problem people trying to solve is treating JSON as computer-human interface. It was not designed for it and I don’t think we need to expand its use-case. You can perfectly use subset of YAML with much better readability for human interactions. I wrote custom parsers for subset I need with like 100 lines of Python code. JSON should stay as a loggable system-to-system format that you can render in a more readable way.
Packages is another story though. Pyenv is for Python versions. For me it’s either that or using Docker images. The later performed poorly with PyCharm when I tested a few years ago. I have seen an issue with Pyenv only once and not even on my machine.
It’s totally up to your knowledge and experience to produce code that supports multiple versions. I had no issue with doing it. That’s what you pay for dynamic language that evolves rapidly.