Percival P. Cassidy wrote:

From the 2008 model year on, such systems have been mandatory because
it was recognized that incorrect tire pressure can contribute to
accidents and that people don't seem to bother to check their tire
pressures these days.

Almost every new safety device has been resisted, either because people
didn't want to pay for it, or because they saw it as itself dangerous
("Electric headlights are too bright: they'll dazzle people; let's stick
to kerosene"), or both.

The Feds predicted about 120 lives a year might be saved. With about 33,000
fatalities a year in the US that is hardly an overwhelming return on what
they estimated would be a cost approaching 900 - 1000 million per year.