Temperature gun for brakes and bearings?

Over the years, I've read many discussions related to the use of an IR gun for checking temps of wheels, tires, bearings, brakes, etc. Despite having read countless discussions on this topic, the fact remains that you'll never read any definitive statements regarding the required temps or when one temp is way too much. Even varying temps mean little to nothing except HUGE variations. On a hot summer day, I've had times when you wouldn't dare touch the tire on the sun side, but the shady side will be just a hair more than warm. Put the gun away and enjoy the trip instead of spending half the time worrying about temp data that you don't know the answer to in the first place.