I don't understand why you would ask if you should expect something to last at least as long as the manufacturer warranties it for...the answer is YES!
The car in your example is warrantied against manufacturers defects for 4 years OR 50,000 miles
Your computer is warranties for a year. You have purchased a computer and the piece of mind that if it fails during the warranty period, it will be repaired or replaced. You probably could have purchased a used computer for significantly less, but it wouldn't have the 1 year warranty
Warranties are a Marketing tool that helps ease Buyers Remorse. If it turns out to be junk...they will replace it.
OPT used the lifetime warranty on OCP to sell more product at a higher price
If I bought mud flaps that had a lifetime warranty for a 2013 Suburban, I would expect that they would last until the final mile that truck was in use
Large companies have actuaries who do in-depth analysis of ROI when offering a warranty. Maybe, OPT didn't do that and the warranty costs proved unmanageable, maybe someone sued them for deceptive marketing practices, maybe, lots of maybes
To paraphrase Mike Phillips, Words mean things, choose them carefully
Lifetime is Lifetime