I think that some of it may have to do with people not taking the time to build up to the heavy weights.
You can pick up a 40# and start shooting well with it long before you can a 60+, and like it or not most people are still lazy and want to shoot instinctive within a week of starting with a bow. This is why the compound is so popular too.
I have and do start as many as I can into trad, but I push them toward cheap low weight bows to start out with. It lends itself to better form, more accuracy, and confidence. Get the form right to start with then they can shoot about anything.
I wish someone had tought me that when I started.