> but that most code bases will require you to earn an architecture astronaut certification for that particular code base.

sure, if go would be popular in enterprise dev, we would see magnitude more error handling spagetti and genericless copy-paste code in go

> But also, the Go spec is a couple of pages

I think you undermeasured it by 20 times. Also it is very possible that golang spec is much more shallow. But anyway, I don't think one need to learn java spec to learn the language.