That's one reason why we have religious wars over operating systems and programming languages and tool sets that you don't see in other engineering cultures. (And also why more relaxed companies focus more on the mantra of "right tool for the job".) Since I don't touch gamedev with an eleven-foot-pole, it's not clear to me how much of a cost has been incurred by this.
And it's this exact kind of thing which lets unexamined biases manifest in the hiring process, leading to an overpopulation of white males.