FWIW, one of the biggest obstacles to adoption of RPC components in our C++ codebase at work (not FB/Meta) is clean integration with our preexisting Folly + lib

FWIW, one of the biggest obstacles to adoption of RPC components in our C++ codebase at work (not FB/Meta) is clean integration with our preexisting Folly + libevent scheduler. IMO, this has become a common theme across most C++ libraries that involve async IO. Rust has the same problem to a lesser extent. I think it's going to become a fundamental problem in all languages that don't have a strong opinion on, or built-in, async and schedulers.