If you have ever had to use gRPC & web, then you will know how painful Protobuf is to make it work on the web. I love the simplicity of Cap'n Web https://capnproto.org/language.html , hopefully this will lead us to better and easier RPC.

Update: Unlike Cap'n Proto, Cap'n Web has no schemas. In fact, it has almost no boilerplate whatsoever. This means it works more like the JavaScript-native RPC system in Cloudflare Workers. https://github.com/cloudflare/capnweb