Consider the good old stock quote example from REST vs. RPC discussions. In both variants two kinds of coupling exist.
On the one hand there is the intentional coupling that causes the client to make the call to that particular remote thing and not just any arbitrary one. The intentional coupling is a human choice, manifested in configuration or code.
On the other hand there is technical coupling because the client software needs to know (aka be coupled to) the provided interface. Otherwise the communication would no be able to happen.
Given those two kinds or layers of coupling it makes no sense whatsoever to repeat the specifics already present in the intentional coupling at the technical level by giving that specific remote thing a specific interface.
Once the intentional choice has been made to talk to that remote thing the interface specifics can be factored away.
Why design, implement, test, maintain, document and explain more stuff if you can do the same things with less?
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