I think Michelle once mentioned during an interview that skaters have to do so much more now than they did in the past. That it seems that they are rushing from one element to another because there are so many requirements. If skaters don't have to do all these transitions and level 3/4 step sequences and spins, more of them would probably be attempting 7 triple jumps. Jenny Kirk also jokes that some skaters then used the spins as their rest period and you can't really do that now.
Except that lots are attempting 7 triples. More than did under 6.0.