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How is it any different in any way than any other async function? You just end up providing an unusually large number of parameters via headers and body, then at some point in the future the request completes with values and/or errors. What separates them?

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Classic RPC functions would never be async, since the idea behind RPC is to replace a sync local function with a sync remote function, without having to make any changes to the calling code.

"Async RPC" is a more recent idea, but still gets referred to as "RPC", so the complaints about classic RPC still get raised since the term is overloaded.

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