I suspect this has to do with the level of integration of the piece of tooling. I used to write Rails apps many years ago (before SPA was a thing). I realised at some point that I had memorised all the methods of both Ruby and Rails by that point. Yes, there were certainly edge case tasks where one was using a new library (auth comes to mind) where heavy googling was necessary, but there was virtually none for the day to day stuff.

React on the other hand never got there for me. I suspect that it’s the many libraries awkwardly glued together (ugh react-redux), with often complex APIs that makes it difficult.