Because when you are favored to win by 16 it means you should not struggle to win. If we win big, it means we did what we were supposed to do. We need to start looking like a team that does what heavily favored teams should do. Win big.
The reason we are an afterthought in the ACC for the title game is not just because Clemson beat us badly, but also because other than FSU, we can't pull away from teams. That leads people to say, "Miami isn't as good as their record". So far, they are right. If we want to have any shot of ever getting to where we want to be, we need to be good enough to stomp struggling teams like Duke.
And I do agree. UNC is a bigger test. It is a different kind of test, though.