I won't disagree there. Most of what we hear is midrange and treble, just due to the way our ears are designed. Ultimately, I do believe with the right EQ, speaker cabinet configurations, and right hand placement any bass can sound bright or deep as we want.
OTH, marketing hype is just that. And I think that Rob is actually saying the opposite of the truth. In studio, where you can sit down and really work out the sound you want on the record, you use whatever fits the bill and you can control the vertical, horizontal, and Z-axis as much as imaginable. And I know of several players, Mike Watt, Dusty Hill, and others named previously who use shorties on stage, because night after night, a shortie is easier on the body.