[ChrisAtWork]

There's nothing wrong with RPC APIs. Other than being "Not Cool" due to the legacy of SOAP, they can deliver some very nice value.

Various RPC mechanisms like Bond and Protocol Buffers (and more recently GRPC) are trying hard to make RPC cool again. Personally, I hope they succeed, as REST (like any technology) doesn't work for everything.

[tracker1]

For that matter, communication abstractions over websockets... Which has been most interesting to me in terms of offering some better security choices.