I don't think that's a stupid question...Sure, in this case, there's really no question that a call was missed, but think of "holding". Whether "holding" occurs is a judgement call, and could probably be called on every play. Could you imagine it being reviewable? Also, think of facemask severity...That is also a judgement call. I know what you're saying, and I would listen to arguments for having "blatent" missed penalties be reviewable (if there was a way to do it that could keep it from being abused), but other than clear cut things like illegal touching, it'd be tough to add penalty issues to the mix.