Here's my guess: Bars are the width they are now and have always been for a reason. One changes what works at one's peril. In this case, the peril is losing control of the bike when the front wheel gets in trouble, which happens for a great variety of reasons. TTers use these narrow bars on swept courses. Another reason is that hand movement of any sort will result in great wheel movement, not always a good idea. MTBers use great wide bars w/r to road bikes because they have to fight greater forces and want more leverage. It's just a matter of scale. There are also issues of muscle fatigue. We like hand positions which are in front of our shoulders to reduce strain. Aero bars work because there's pretty much zero muscle involvement with the elbows resting on pads and there's lots of leverage. That said, being down on the 'bars is not recommended when negotiating even slightly technical terrain or riding around sharp corners.
You're better off being slightly less aero and uninjured. I've seen riders lose a whole season from front wheel disasters.
__________________
Results matter