> it's not like SOAP+WSDL actually worked well either, it was always unreliable

This is comparable to saying that "multiplayer distributed architecture at scale" never worked well and was unreliable. All depends what your needs are and how the design and implementation satisfies them. SOAP+WSDL were part or a larger technology vision of Service Oriented Architecture (SOA) with all the complexities of distributed architecture. And the attempt was to make all of that open standards based.

I worked in Print at the time at one of the largest companies (now gone bust), and can confidentally say that SOAP+WSDL worked perfectly for us, and made it way more reliable to tie all these very specialized printing equipment with archaic languages and interfaces together, increasing productivity and efficiency of the entire print process.