disagree, coupling is a logical connection, and has nothing to do with calling-semantics. Whether a local function call or an RPC, its still the same level of

disagree, coupling is a logical connection, and has nothing to do with calling-semantics. Whether a local function call or an RPC, its still the same level of coupling, this is just a difference in the (equivalent of) a link-layer in a network stack. Adding a network connection is a much more complicated calling-semantic than a function call, many more and different failure modes.