I feel like this is not a hot take, the big problem with JS ecosystem is the lack of stability. Every JS developer seems ok with picking their 100 favorite packages for each project instead of rallying around some core packages that everyone works on. Personally I don’t like the TS approach for large monoliths because I don’t like having to pick each library a la carte. I do prefer Typescript’s gradual typing system, but Rails wins in being easy and quick for development.

The big difference between the Rails and Ember approach vs most framework communities is the shared community around a shared tech stack.