[cracell]

I wouldn't say that.

My team uses a Rails backend and React apps on top. For us, React apps compared to Rails views just about cut our feature delivery time in half.

Of course, it depends on what domain you are working in. Dynamic frontends on Rails are a pain compared to React and probably some other front-end JS.

That said, on the backend Rails is a very mature framework that is hard to beat on most things.