I suppose it's because if your legacy products are already built with what's essentially a HTTP-RPC protocol, you're not going to want to build a REST-inspired

I suppose it's because if your legacy products are already built with what's essentially a HTTP-RPC protocol, you're not going to want to build a REST-inspired framework. I think REST is like the 3rd normal form of databases. In theory it's great, but in practice people only try to get close enough to the abstraction.