One of the problems is who decides what is too simple. E.g. why are for loops, function calls and lamdbas considered simple enough to be in go, but generics aren't? When I TA'ed CS introductory courses, student usually had a lot less trouble with understanding generics than lambdas.

Not including feature X in programming language Y will also ensure that no-one who primarily uses Y will ever come to understand or appreciate X.

The blub paradox basically represents the opinion that it is always better for languages to include more powerful features.

I think that goes too far, working primarily in Scala I am seeing firsthand how much diminishing returns extra complexity in the language can have, but I'm certainly of the opinion that Go leans too heavily toward handicapping the language in pursuit of simplicity.