It is an emphasis bc taking it to the house is a display of top end speed, but if you have that type of speed you can turn 5 yard run into 10-15 yard runs.. It also provides constant stress on a defense. If you miss a fit against a slower back you can still rally and make a tackle for a manageable gain. If you miss a fit against a burner it can go for 6. I remember watching Frost at Oregon and UCF and watching tempo put pressure on defenses to the point where they would misalign. The next thing you knew the RB was taking it to the house.
I do like the fact that they are committed to having a bigger body back that can wear on a defense and get tough yards.