Just to add a few bits: I'm not an infra person so can't tell about managing a H2 deployment, but from frontend web performance perspective H2 is very interesting and somehow not used to its full potential.

H2 has built-in support for interesting concepts like prioritization and re-prioritization of requests. Unfortunately, most impls in clients and servers are either not full or not very good:

I recommend googling "http/2 prioritization" and checking blogs and talks from Andy Davies and Pat Meenan. The subject is super interesting and inherently hard; browsers need to make certain assumptions whether scripts, fonts or CSS are more important and should be prioritized and it's non-obvious how to handle it best.

https://github.com/andydavies/http2-prioritization-issues

https://medium.com/dev-channel/javascript-loading-priorities...