Last year isn't a constant variable. It's not like we're trying to match our prior time on a track or something. Who's to say that the other teams also won't get better? For instance, Virginia seems a hell of a lot better than whoever finished #2 in the Coastal last year. Also, we were averaging a touchdown more per game at this point last year (useless comparison, I realize, but both examples include two P5 teams and a scrub team as the competition).
I think people are banking too much on last year duplicating itself. It's a new season. I do agree that the defense is better. Shoot, the quarterback also looks better. But we also don't have four all-conference linemen and an NFL fullback blocking for an NFL running back. For better or for worse, things are just different.
Again, I get why Pitt fans are thinking as they are. But you don't think Virginia Tech, Miami, etc. fans are looking at Pitt right now and saying, "Well that should be winnable, because they can't even crack 20."? Like I said, it starts with us. If our offense doesn't improve, there isn't much hope.