Originally Posted by Bob Ross

...and yet so many framebuilders and manufacturers have suggested that it "stiffens up the front end" or something to that effect, which, if you think about it, seems plausible. Doesn't mean it's true, just that it makes sense in theory: A thicker, stiffer axle that is solidly threaded into the dropouts ought to resist independent movement of the left & right fork blades more than a conventional QR lever. :shrugs:
Whether there is tangible benefit -- or discernible difference -- from a "stiff front end" becomes the next question.