Sure Python3. I wouldn't say everyone is updating to the latest versions though. 15% of people still on a version that's over 5 years old is pretty bad. Most modern languages have pretty much everyone on the latest version.
It's because until very recently getting the latest version of Python has been very difficult (at least on Linux). The official answer for how to do it was "compile it from source" which is kind of ridiculous.
Fortunately we finally have a better option - Rye (and maybe uv now?) can install recent versions for you. Hopefully that will improve matters.