> "Reliable" is also a vague value judgement It is not. Reliable: message delivery is guaranteed, i.e., the message _will_ eventually reach its intended destin

> "Reliable" is also a vague value judgement It is not. Reliable: message delivery is guaranteed, i.e., the message _will_ eventually reach its intended destination. > "Shared memory" implies data coherency. It does not, re. CPUs with weak memory models. Yes, you can insert barriers, but what happens underneath is that HW exchanges a bunch of messages (reliably!) between nodes to bring them to a consistent view of the global state.