Kind of like some generic gRPC interchange/CLI API with native OS support? Something like that could be neat. I conjecture the main problem with gRPC is that a lot of developers (myself included) find dealing with it a bit unwieldy compared to more native (by native I mean in-language) solutions.
If you look into IPC primitives in each OS you can find goodies that do expose structured metadata about what interfaces are available and how they can be called. D-Bus, sd-bus, COM, Binder, to name a few.
It’s just that the tooling around it isn’t as easily exposed and they aren’t tailored for on-demand launch via command line. If the shell treated such as a more first class citizen, good results may come out.
Another big problem is portability, if you designed your app with sdbus, it’s not going to work on a non systemd distro, even less on Windows. What’s needed is a standardized abstraction layer on top.
