I totally agree with that, in theory. In practice, sometimes teams can be spread too thinly to allow adequate code reviews, developers can have egos associated

I totally agree with that, in theory. In practice, sometimes teams can be spread too thinly to allow adequate code reviews, developers can have egos associated with their titles that prohibit constructive criticism, and management can favor "if it looks like it works, it works" style of project delivery. These real world scenarios bias me towards people who know the language they will be using daily.