I agree. I think though there is something of a business case in that, once you've got a good core team (if the team is large enough) there's something to be gained by broadening the experiences of new team members.
But that's not really my point. It's more about 'why is diversity a good thing?' And it's a good thing becuase you don't want to exclude good people for arbitrary reasons.
Now if you start from today, there's only so much you can do, because a great many potentially very good people have already been excluded. They were excluded by parents, teachers, the media and every other influence that helps to convince girls (and perhaps ethnic minorities, I'm not sure) that tech is not for them. I don't think it's done deliberately, it's just where we are.
I think I'm beginning to see that the reason what I wrote was seen as trolling might be because it was assumed I was being politically correct?
In fact it's a business case issue for me. You want the best people for your industry, you want the largest pool of talent from which to recruit. To get the largest pool of talant you want schools pushing those with an aptitude for engineering towards the topics at which they excel (assuming that's what the individual wants).
If you're (inadvertantly) steering a future mathematics prodigy into humanities because 'girls don't do that sort of thing' you're harming everyone.
That's what diversity is about - not excluding people based on race, gender or sex. And that surely is not controversial?