[izacus]

Some cars use ABS speed sensors instead of that which is usually a bit less accurate, but also less of a hassle.

[ExoticPearTree]

Yes. But in my car the downside is that it does not tell which wheel has a problem, just a generice message: check tyre pressure.

Real TPMS sensors inside the wheel give much more accurate information.

[procaryote]

That's a software issue rather than an inherent limitation. I've driven cars with abs-sensor based TPMS that will tell you which tire is under or over-inflated