It doesn't seem unreasonable to me to ask why someone would use a version language that is going to be deprecated in just over a year, when newer versions are readily available.
Is it that hard to assume they either like it more or they couldn't use a later version because of a dependency? The only scenario this question would be useful in is if they had no idea the later version exists, which is a boat I have yet to see anyone fall into. Unless, I guess, it's one of those "questions" that isn't looking for an answer, but simply looking for an opportunity to chastise...
No, but the project will be dead in a year (or rather bitrot will set in), so if there are old dependencies then perhaps effort should be put into porting or working out the kinks in Python3 dependencies doing a similar thing. I understand for a hobby project that's a big ask but it's not unreasonable to question, I think