Perl still loves you and will always be there.

I'm sure that there are still Python 2 codebases there running an unsupported interpreter, but for most people that has been at least 5-10 years ago. Also, the Python project learned a lot from the messy transition, that I think it's unlikely to happen again.

That was almost 20 years ago! We migrated 2 to 3 10 years ago. I'd say I moved on. I doubt there will ever be py4 :)