[Anechoic]

you have to wonder why they didn't correct the pressure.

AFAIK, teams are not allowed to reinstall balls during the game, refs can, but they obviously didn't detect it until they measured the pressure at halftime.

Quarterbacks are surely able to detect the lower pressure

Everyone seems to be taking this as a given when it's not at all. There are qb's who can detect it, and others who can't.