Before my current team, my whole career, every single team I worked in was pretty much exclusively young, white, nerdy men. Maybe each person on those teams was objectively the "best" candidate for their respective hiring round! (though I doubt it) But they make horrible teams. If your team looks like that, your team is horrible too, no matter how much you tell yourself it's not.
My current team is a diverse group of well-rounded people. Some women, some men, some younger, some older, from many ethnic and cultural backgrounds.
Guess which is the higher performing? Guess which has a safe atmosphere with zero dick measuring? Guess which is the most pleasant to be a part of? Guess which has zero tolerance for any toxic behavior? etc etc
Sure, there's lots of room for improvement in how tech businesses actually implement diversity vs just paying lip service to it and slicing numbers. But don't pretend like diversity isn't sorely needed in the industry.