I believe the hype of RSC it's just a natural part of it being a NextJS/React core feature from those teams, and not a 3rd party package like tRPC.

React and Angular won by being backed by FAANG first, people loves to choose FOSS backed by big names for some reason gives them pause

Believe it or not, not everyone is even using a flavour of React.

One nice side effect of using tRPC is that you can pack up and move to a different framework on the front-end if desired, and a lot of the tRPC work can be used directly