I think that the underlying discussion is an interesting one. HN readers perhaps might get some benefit from understanding SAP technologies and how they integrate into the stuff they want to hack with. I've employed some real hackers into the SAP market and it is a deeply interesting and open technology stack.
That it is. Clearly SAP is doing something right.
Somewhat off topic, I'm surprised you say "open technology stack". I'm not particularly familiar with SAP tech, but I always thought they were as closed as it gets (& successfully so). Have I missed something?