Again: the running is great, but what does it matter if he gets your QB hurt because he missed an assignment? What happens then? Now people load the box against you and it's no longer a free ride to 4-5 yards a clip. That is a serious part of the equation that gets lost a lot because more often than not there's more focus on the result than the process. The process is you can't run every single down against every team so you need to be able to do both run well and block well. If you can't do the second well, then it doesn't really matter how well you do the first part. All of a sudden it's 2nd and 8 at the 15, someone is about to flash open but Mitch can't hit them because Demond misses CJ Taylor coming in on a blitz. Now the play is dead instead of a free touchdown.
But it's not just Wake that does this, it's what football as a whole is moving to. Jahmyr Gibbs was the 12th pick in the draft, Jase McClellan (who certainly won't be the #12 pick this year) had 111 carries to Gibbs' 151. Ole Miss had Judkins and Zach Evans in a time share last year. Clemson does it with Shipley and Mafah. UGA had a time share with McIntosh and Edwards. Football is moving towards a committee approach at running back at the collegiate level for a similar reason to the NFL: the running aspect of it can be decently replaceable so you have to mix and match for the situation. Some might be better at pass blocking, some better as receivers. That's just what we're moving to as a whole.