I will admit that, admittedly without doing any research of my own (as I'm sure that Arlen has also not done any research, because facts and data often get in the way of his arguments), that it does "feel" that HBD does not seem to have the same outliers that MLB does in terms of strikeouts and walks. I could be wrong, but that's just a casual observation/feeling.
But . . . much of that is self-inflicted by us, the owners. We place premiums on ratings such as contact and batting eye for hitters . . . maybe too much of a premium, at least when compared to what MLB managers will tolerate. We also place less of an emphasis on velocity for pitchers, considering it a secondary, or less important rating.
I think there may also be too much of a premium on control for pitchers, compared to MLB. Case in point: Carlos Marmol, the Cubs closer. Last season he saved 38 games, had a 1.18 WHIP and a 2.55 ERA. He also walked 52 batters in 77.2 IP. In HBD terms, that's a control rating of maybe 40 or so. Not too many HBD owners are going to be willing to live with a closer with a control rating of 40, even if his splits are in the high 80's.