I'd like to see a reliable source for that info. I just tried an experiment (getting into a push-up stance) with my arms close together, and far apart, and notice no difference in how much air I can suck in.
You guys would hate the bars on my bikes. They are all cut down to about 22". Anything wider feels awkward. I don't recall ever crashing because I didn't have enough control with narrow bars, but I have caught a few trees with wide bars. I agree that it is basically personal preference though.

andy b.