My sample size is small, having only owned 2 out of dozens of vehicles with any factory or extended warranty in 30+ years and my experience this far is the warranties were largely not needed.
01 Ram purchased new, lost 2 rear differentials in the first 2500 miles. Warranty covered and I would have been out of pocket, however it was a rare and such a gross defect that it basically was bad before it pulled off the dealer lot 2x in a row. Freak deal mostly. But it was egregious enough that a dealer in the middle of bfe where the second failure occurred gave me a free max care max mileage warranty for my troubles (there are a few good dealers. Billion Chrysler in SD was one.) and 125k miles later, I used the ext warranty once for a minor trans repair. Stuck solenoid or something I recall I diagnosed and could have fixed for $100 and a pan drop. And it didn't render the vehicle out of service or even reduced ability.
New 2016 car had a leaky radiator right out the gate, early in factory warranty and likely to have been handled by the time it was purchased used, down the road. Or cheap repair at a radiator shop or worst case $400 and a few hours to RnR with a new radiator.
Have had about 20 new company trucks in the past 25 years though, and warranty work visits I could count on 1 hand almost (if it weren't for 1 lemon). Of that warranty work, the lemon was major items. Plugged cat burned up part of the engine bay and trans scattered on the highway, literally. Plus a few other issues. 1 Chevy with a new trans at 60k and the other few items between all the trucks were relatively minor in nature. Couple bad injectors, a coil pack, etc.
And this was on vehicles that get driven like a rental and used beyond their ratings.
Tire failures shouldn't even be part of the discussion. They're tires and literally subject to every hazard on the road. Treadwear warranties are an advertising bit and road hazard is a money maker for tire shops just like extended service contracts.
