I'd like to learn more examples of this toxic positivity. In my experience, Ethereum Magicians is full of discussions, CT as well. That's btw why people think that Ethereum has no roadmap - because EF researchers discuss in the open, with the recent example of Péter Szilágyi bashing Justin Drake's Beam Chain idea. However, maybe the author has some more examples in mind, apart from the one mentioned regarding the Beacon Chain and centralization.
I actually observed this myself years ago and wrote a post about it: https://news.kiwistand.com/stories/Against-Toxic-Optimism?index=0x673f137fea46484c46ca22a5b49b739e1c19bada6bbc5f8f741eef62c9be734e8210b87e