It is the decision of the respective packagers which version they
provide and how much effort they want to put in. If you have issues with their decisions, you could try to submit a bug report to their respective bug trackers.
Btw., Debian and Ubuntu provide PL/Python for Python 2 and 3, so it's possible. And it happened because someone submitted a bug report, and someone put in the effort. ;-)
I guess this mailing list topic has got enough EDB people eyeballs, but is not touching enough.
I suspect time will be spent more productive creating windows build environment and building required thing by oneself.
Personally, I think the Windows packagers made a mistake by providing Python 3 only at this point.
