I'd argue that social proof often makes for a good argument. Perhaps not the best argument, but still a good one. "Best practices" still carry weight. Of course

I'd argue that social proof often makes for a good argument. Perhaps not the best argument, but still a good one. "Best practices" still carry weight. Of course you can make an argument that the thing everyone does is wrong, and win. That's happened millions of times in this industry. But if the argument is nearly strictly between "this is what everyone does" vs "this is what I do", the former is going to win.