I had a system I needed to integrate into a workflow engine. I looked at the available interfaces and, noticing that the SOAP API was the most feature complete of the bunch, I figured I'd give it a try.
Guess what; no one is iterating on this stuff anymore. The standards specifications quit changing years ago so the targets aren't moving. The libraries are feature complete, solid and efficient and only infrequent bug fixes are appearing now. It works wonderfully.
So now you can grab a WSDL, stick on the resource path, add a code generation step to the build and it all "just works." The endless backflips and somersaults it took to get this stuff working back in the day has been evolved out of the stack and we're left with simple, type-safe RPC over HTTP, which is all most people ever really wanted.
It means someone of those who make it is capable of making pragmatic decisions.