In hindsight he can say it was a mistake, but it was glaringly obvious back then that Django, Python 2, or Python 3 wouldn't give you a situation where you woul

In hindsight he can say it was a mistake, but it was glaringly obvious back then that Django, Python 2, or Python 3 wouldn't give you a situation where you would have minimal maintenance for the next 10 years because of the volatility already publicly discussed. But maybe you're right that this isn't something people think enough about when choosing technologies and the author is trying to raise awareness.