Pics from guys in the transition era trying to make the aero bars work on their funny bikes - just to show that even the guys' on top of cyclings Mt Olympus cant ride slammed aero bars on a funny bike
check out the headset spacers and the height of the aero bar risers on some of them- and their positions are still very low
-- a typical club rider or lower categoried racer is not that flexible either and would likely need the bars positioned higher still
Another pic of the infamous Laurent Fignon, riding it as it was designed, - with bull horns only --- We all know how that turned out for him -- but with the stem raised a bit, would almost be an attainable position for a lot of us
Even some of the kids' today have to get the bars up there a bit to effectively use them -- although its no surprise with Taylor Phinney, he's 6'5
But regarding the even more extreme positions of track pursuit bikes ------ A 4000m pursuit is a 5 minute race , and a kilo is anywhere from 1:00 to 1:15 ------- It doesn't have to be comfortable for an hour like a road TT machine should --- you just have to hold on tight for a few minutes and churn your legs until you are coughing up blood