A few key points in my mind:
Hindsight is easy, especially after a loss. We should have tried something differently. But what? And would it have been even worse?
Geno makes mistakes, but is on target far more than anyone else, especially in terms of preparation. Regarding in-game decisions, he may not be as strong there as in developing players and planning.
There have been a few cases where I have disagreed with Coach, but he would have been right far more than me or any of the rest of us.
As noted, particularly with a December game, he may coach more for the long run than for the game in question. For example, let the kids figure something out, even if it risks losing that game. The gain would be that it would not happen again, especially in a more important setting in March or April. He could also create a teaching moment: here is why we lost, and here is what you need to do to prevent another loss.