Or consider the fact that Olympic lifters consider thick pecs a serious disadvantage, interfering with movement of the bar.
Obviously, Olympic lifting-style training is not then going to result in a Mr Olympia style physique.
If a successful top bodybuilder finds that a given Olympic lift helps his muscular thickness, I expect he does it. If over the course of his many years of experience he concluded that it did not help him for his purposes, why should he do such lifts?
I am not at all sure that the thickness of some muscles of top Olympic lifters has so much to do with the excellent, for that purpose, of the training methods, as with the fact that those that don’t have a gift for thickness of those muscles WON’T BE A TOP OLYMPIC LIFTER.
And so there’s a selection process going on, unless you also make a point of checking out the physiques of a more representive sample which is almost entirely folk that don’t wind up being top lifters.
Additionally, I expect that a number of successful bodybuilders – as well as all kinds of lifters dedicated to building muscle – don’t do Olympic lifts because they find that personally there is a resulting injury rate or likeliness of injury that is just not worth it.
For example, it is certain that if I do cleans of any sort, soon I will have tendinitis that will preclude direct biceps work for months. Not worth it when not involved in competition requiring that lift. No matter how wonderful various coaches may have it to be, it surely is not NECESSARY for optimal bodybuilding results.