Interesting. I usually do pretty well in interviews and I've always attributed that to my four years on the debate team in high school. This tells me it might be even more true than I previously thought. Even when I'm nervous as hell, when you put me in front of a judge (interviewer), I click into "performance mode" where I project confidence even if I
know what I'm saying is BS, let alone just a bit unsure. This is how you win parliamentary debates when you've had five minutes to prepare for a topic you know little to nothing about—and I guess it helps in interviews too!
That and debate gave me the ability to just start a sentence without knowing where it will end and then talk my way to a conclusion that sounds like it makes sense (useful when you have 2 minutes to prepare a 3-5 minute speech on a topic you've never seen before). So when I get up in front of a whitebard, I just start talking confidently, and even if by the end haven't solved the problem quickly or efficiently or at all, it sounds like I've been thinking sensibly about it.
My takeaway, I guess—parents, make your kids do debate!