In Romania there's an old question to find the character of somebody: are you Roman or Greek? Because if you are Roman, you put practice above theory, you are a pragmatist, skeptic, if you are Greek you will put theory above practice, you are an idealist, optimist, at the expense of hardships in the material world and other potential drawbacks. Rob Pike chose Roman, otherwise it would have cost Google money to train those people and we don't know if those language features could bring any benefits for the kind of software they develop. As he said, they are not researchers working with category theory, instead they program ever-changing software for an imperfect world driven by profits, rather than academic idealism.