I think he was probably frustrated by Python 2 support. If twisted has 50% userbase in Python 2 that don't upgrade and requiring more volunteer time on Python 2

I think he was probably frustrated by Python 2 support. If twisted has 50% userbase in Python 2 that don't upgrade and requiring more volunteer time on Python 2 just handcuffs language development on Python 3. Python 2 has been deprecated for long time and if people still want free Python 2 support I think it's just indigenous to the language contributors to spend their already constraint free time on Python 2.