Comment by kotaKat

> passed down almost like guild knowledge, only within large organizations.

That's the part that always killed me about trying to set foot into IBM mainframes. "Ask your system programmer". "Ask your X/Y/Z". Even when they finally decided to ease up and let people touch z/PDT, they had to make it a massive learning obstacle course to be blessed enough to buy a license (and now that's gone).

Not all of us can go out and acquire an entire IBM z and be blessed enough to be able to throw it in our basements to build up our knowledge on. :\