I have heard this rush to play several times. Athletes, physically need more than a couple of weeks to be prepare for one of the most brutal sports played in the US. Additionally, blocking and tackling effectively and safely takes a lot of repetition and coaching. These players should not be rushed to play to appease us because "we want it NOW".
This does not even include the complexity of adding offensive and defensive concepts. Most teams probably have the foundational concepts, but this is BIG TEN football not Jr High or HS football. They have to scaffold concepts to get to the intricate offensive plays, defensive coverages and blitz packages, etc that we see on Saturdays.
As a HS coach for 21 years, it was difficult for us to get all of our plays and defenses in for the season without the normal summer we are used to.
For example we usually have at least 2/3 of our offense in for the first 1/3 of our season. The additions come throughout the season. Properly polishing the foundation and adding the intricacies takes time.
I assume colleges operate the same way to a degree.
I understand the frustration, and honestly I think we should have started this weekend like other Power 5's. But this is the current situation we are in, and now that they have delayed they have to give the athletes, teams and coaches the appropriate time to prepare mentally and physically.