Excellent read. I agree with a lot (after only a cursory read). One thing the author seemingly forgives R by not mentioning is how harsh and discouraging of beginners the community was at some early stage. That was my experience around 2002-2006.
I'm not sure that's true anymore. The one thing that I find interesting about the R community (being at home in Pythonland myself) is the availability of great teaching and learning resources. At least that's the case in the social sciences, where R has pretty strong adoption.
Yeah I tried to publish a package back in like 2015 and was dealt with very harshly, got banned for a week from submitting for asking questions about the process after the first attempt didn't work. It really turned me off R and frankly I haven't looked back.