Ha, I expected it to be about SOAP the protocol https://en.wikipedia.org/wiki/SOAP but this seems to be more interesting. I suppose if you have a Galactic Empire sized business, maybe something like SOAP (or EDI) to really nail things down makes some sense. Otherwise I'm not so sure.
Not a year goes by where I’m not convinced that things would be easier if as a community we used a modern version of the soap protocol, maybe with JSON instead of XML. RPC is such a clean design compared to REST, and it we had auto-generated client code 15 years ago, something the likes of swagger are still catching up with.
Why do you think RPC is a cleaner design than REST?
I think resource orientation works really well, most of the time.