> I know some people will use Python 2 beyond EOL, but at this point that's their task and the task of whomever they pay for assistance, not everyone else's

Virtually every common OS (i.e. Windows, iOS, and Linux) provides Python 2.7 by calling `python`, and Python 3.x by calling `python3` so it's more than "some people" using Python beyond EOL -- it's two languages being used simultaneously.

This is what most languages do when they make a breaking upgrade, e.g. Perl 5.x and Perl 6, or Apache Groovy (which ships two compilers in its Groovy 2 download bundle, i.e. the Groovy 1 compliant one used by Gradle and Jenkins etc, and the later 2012 one with the invoke-dynamic capabilities added. Two weeks ago, the Groovy project managers announced that Groovy 3 would keep on doing this, putting the rewritten parser into the compiler which no-one uses, and keeping the main compiler at Groovy 1 capabilities.)