I was referring to your "only downside" statement (size and mutability of messages). No, that's far from the only downside, and in my experience, not even the m

I was referring to your "only downside" statement (size and mutability of messages). No, that's far from the only downside, and in my experience, not even the most important one. > In the cases where we use these, the caller is aware (via the interface documentation) that this is a distributed system where sometimes invocations happen really fast and reliably. This is at odds with > I have systems where the decision to put the module in the same process or to call it via RPC is done at runtime. Either it's in the caller's choice (based on the documentation), or it's at runtime, but it can't be both and be equally reliable.