Pushrod Blues . . .

Why do these aftermarket companies make their pushrod diameters so big they hit on everything.  They touch and rub on the inside of the covers, they can hit the rocker boxes . . . They should just make a nice, thin set of pushrods that expand and contract properly (like H-D intended).  What's wrong with some light, steel rods?  These things are moving like a 1/2" . .  if that.  I don't believe we're gaining that much horsepower advantage, for the pain-in-the-ass these oversize push-rods cause.