Many have already explained the larger lifter bore is an advantage and not a myth, but shelf cams are never going to push the envelope as far as acceleration etc. They are generic, high volume production camshafts, they only thing they'll tweak is the lobe separations and how the lobes are paired.
Comp, Bullet, and Engle do high acceleration lobes for 0.904" as a custom for good reason. The average guy isn't going to correct lifter bore geometry with bushes, and often the bore orientation is out of phase, resulting in lifter or camshaft failure.

Jesel make 1.25" roller wheel lifters for Pro Stock and the like these days for good reason