Coming from Zeit Now/Next.js where I remember HTTP/2 was described as important for performance, for me as a complete non-expert it felt as a regression when I came to Rails/Heroku with the recommended Puma HTTP1.1 server; also ActionCable uses Websockets which has its limitations and is said not to be so needed with HTTP/2 (thanks to this thread for the link).
As an experiment I tried adding early hints to Puma but encountered blank page issues (reported by users, which I could then reproduce via an ngrok to my dev server).
A version number in itself does not mean anything, so do we need to care at all? What are the current framework limitations and opportunities in relation to H2? I would be grateful for any info on historical choices and the planned direction for HTTP/2 in relation to Rails.