I don't think anyone expects perfection, but some of these missed or bad calls in recent memory are so glaring, and when they happen at the end of games and decide outcomes, it gives a bad look. And the NFL acts like they don't care (which they don't). Heck, look at the new rule about being able to challenge PI. I don't like being able to challenge that, but there have been countless examples already where something should have been changed, yet they went with what was called on the field, almost like the NFL is pissed that they were forced to implement it and have made it clear to not change anything challenged unless it is extremely blatant (and even that is not a guarantee, as we saw in the NYG/NE last week where a clear as day PI at the end of the game still wasn't called despite being challenged and being extremely obvious on the replay).