Thus spake JRStern :
Yup, EVERY manual says to never bleed air from a hot tire.
I've autocrossed with a lot of people who use bleed valve guages. If you're up for the ~$400 price tag.
That's the point. Not that they were "equally" low but that one may have been "too" low and the others were "just above" the limit.
But I always check mine. For exactly the two reasons you and I mention.
The sensor is actually ABS based (as opposed to the F1 sensors that really are pressure based). ABS measures the rotational speed to figure out which tire is locking up. Unless your tires, rotars, pads, pistons and master are all incredibly tuned up, one tire will lock first. Stay up late tonight (if you're in the western hemisphere) and watch one of the bought drivers in the GP of China square off a tire.
That is pure BS. Doing that introduces a huge number of safety and reliabilty issues.
A lot of drivers I AX with (including me) will sometimes chalk the tires looking for roll. Too low a pressure and too tight/fast a turn will roll a tire off the rim. I've seen it.