Comment by otabdeveloper4

> I'm still not sure why we even need a message bus in there in the first place.

Because traditional POSIX IPC mechanisms are absolute unworkable dogshit.

> It is one of the worst serialisation decisions we ever made as a society.

There isn't really any alternative. It's either JSON or "JSON but in binary". (Like CBOR.) Anything else is not interoperable.