To paraphrase the immortal words of one Donald J Trump, Clemson was bored from so much winning. It was in no way an example that UNC was good enough to hang with Clemson, it was a demonstration that an elite team can blow a game by being sloppy and lazy. UNC played their best game and Clemson played down to the opponent and was probably giving 25% effort, yet Clemson still won.
A middle of pack P5 ACC team is still considerably more talented than any G5 team. UCF has had a nice little run but Pitt has been at least 15 spots higher in the recruiting rankings the past few years. To put it another way, Miami is closer in talent level to Bama than UCF is to Pitt. Pitt beating UCF doesn't mean the ACC coastal is any good.
The ACC coastal is probably the weakest division in P5. It has about a half dozen or so teams with a blue chip rating in the 20% range or lower and one team with a blue chip rating above 50%. Yet despite that massive talent gap, due to unbelievably poor coaching, the one team with FAR more talent than the others has managed to win this weak division exactly one time in almost 20 years. I'll give you 3 guesses about the identity of this mystery team.