Its even more funny that you'd need a light to tell you to check your tires.
I got a puncture on my way home once a few years back... found it when I turned into the driveway and it felt just a little squiggly, by then of course the sidewall was shredded inside, even though it still had air in it and looked fine.
I check my 305/45/22s like crazy because they look 1/2 flat even at 40 psi.
I even pull over sometimes and check them thinking I feel one that might be down, never is. But then again, I've had tires that looked fully inflated at 5-10 psi.
It's the nature of the game these days, you just can't tell anymore, uber stiff sidewalls, low compliance tires, ultra low profiles... the 'air' doesn't make a lot of difference on the ride quality in comparison to the bias ply, and early radial days.
I am generally glad I don't have the TPMS though. More expense and hassle when changing and rotating tires.