Automatic tire inflator keeps pressure constant

Considering the range of pressure caused by the changes in temperature, would it not keep deflating and re-inflating the tires, thereby introducing H2O into the tires?

My rule of thumb is that for every 10 deg F change, the pressure will increase by 1 psi. Is this really a good idea

Now if the system only kept the pressure from reducing beyond a certain set pressure and also gave a warning, I could see it being useful. So if there was a leak either slow or because of puncture, good idea, IMHO.