Yeah, precisely - React for (SSR/CSR) UI and Elixir for everything else. I think I was too broad, and I could also have been more concise, but I wanted to add some background info as well! 
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I know I could have something along those lines with a BFF (backend-for-frontend) approach, i.e., Remix on top of an Elixir backend, but that would be a bit more complex and arguably also require more maintenance/resources. It would also shift the cognitive focus over to JS more, I think. It just feels that an Elixir-first approach would be more enjoyable, too, and allow me to keep JS to a minimum while still leveraging it when needed.
