> I've read about a lot of evidence that more diverse groups make decisions significantly better.
You have to be careful with this one. It only applies to certain kinds of diversity and certain kinds of decisions, and even then only over a sizable number of decisions. It's not as simple as diversity makes things better, full stop.
And this is without weighing costs!
> Yet US has done just ok with males (white and asian) doing this stuff. Ie better than anybody else in the world.
That doesn't mean the US and others can't do much better. Think how much talent is lost - more than half of it. There's a shortage of talent in SV. There is much that needs to be done in the world.
> Is there any proof that increased diversity has any effect
I've read about a lot of evidence that more diverse groups make decisions significantly better.