And I cringe typing it(having been called just another arm chair guy many times), but it's the truth of the whole point.
Oline is the number one priority at all winning programs.
As to your point, again you control the ball, does the defense run out there time and time again after three minutes resting on the sidelines and get worked over down the field??? Does an OC continue calling pass plays in run situations based on positions they trust one over the other(seen multiple times this year)??? No. How does Iowa continue packing NU's stuff, by throwing it all over the place??? No. They run and wear them down. PSU??? Run and wear you down. Minnesota for years. NW. Wisconsin. Does one need to go on and on. Games may stay close for a while, but things got ugly fast when the defense is running back on the field after just sitting down. And it only gets exposed so much more when you have an undersized group trying to stop a team. Getting first downs and eating clock sometimes in games is as good as a score.