Raymond has been consistent in saying Python 3.6.1 was the release where Python 3 became better than Python 2. That was March 21, 2017, and we're now in Python 3.7.4.

I appreciate the general point that that's far more recent than Python 3s initial release but it's also a large exaggeration to say "until this most current release".

Also to understand why it took so long is because Python 2 kept improving after Python 3s release. Python 2.7 was a great release and many further features from Python 3 got backported in it's 2.7.x point release.