Ya it really depends. I like redis and Postgres generally speaking for data, and Ruby on Rails generally for business logic. And you can certainly do universal rendering with that easily with react_on_rails. If you do end up needing more perf, maybe go would be interesting.
Yes but we're still going a long way from "just use React". One benefit of the "JS sprinkles" approach of Turbolinks+Stimulus is that you have a far simpler and more productive stack: Rails (or other framework) renders templates with some minimal JS on the frontend, as opposed to the inherent complexity of API + SSR + SPA. There are occasions when React is a good choice of course, but let's not underestimate the costs of the SPA architecture.
