SSR is different I think because it can perform better, but given the state of most sites on the internet I think 2003 style rails is sufficient for most sites. And I haven’t met a JS-ey UI I have enjoyed using as much as a vanilla HTML one for most online stuff (drawing, games, 3D etc. excepted).
And turbolinks on modern rails apps literally feels like those fancy JS-ey UIs anyway in terms of responsiveness. Not to mention things like phoenix liveview..