Speaking as a nominal leftie who is effectively ambidextrous for everything but writing, I don't think we're better. I'm just not particularly good at sports. Body-things take more time to learn, and I have to practice with both sides if I want to be good at both sides.
Maybe I'm an outlier, but your notion that being ambidextrous is better is a huge assumption. Having a dominant side could have the same sort of benefit that specialization usually does: better for the cases that really matter, worse for the cases that are less important.
Maybe I'm an outlier, but your notion that being ambidextrous is better is a huge assumption. Having a dominant side could have the same sort of benefit that specialization usually does: better for the cases that really matter, worse for the cases that are less important.