It really isn't. (very) low tire pressure is a major safety risk. The TPMS sensors I've had all seem to go off at minor deviations (few psi) from the tire pressure; deviations that aren't a safety risk.
A useful reminder that the winter is coming, but hardly a major safety risk.
> The TPMS sensors I've had all seem to go off at minor deviations
Good (IMHO)
[1] https://en.wikipedia.org/wiki/Firestone_and_Ford_tire_contro...
If that's your level of risk sensitivity, don't get in a car.
Still, both statistics illustrate the point - 300 deaths a few decades ago involving faulty tires that may have been exacerbated by manufacturer-recommended underinflation have basically 0 bearing on the marginal risk of driving with a TPMS warning light illuminated.