If you have time to peddling your diversify book, write angry tweets, go to conferences and do podcasts. You have time to write code. That is, if you're a software engineer (the people who use Github mainly)
what makes you think coglan and dryden are speaking on behalf of themselves, and not on behalf of all the people who don't have the time and luxury to write code, and are being unfairly and systemically penalised for it?