It's not a warranty. It's insurance on repair costs, with a LOAD of fine print. Now ask yourself , "Are insurance companies in business to lose money?" Nope, not in any universe I know of. So in the aggregate, they're paying out less than they take in, actually by quite a lot. So now ask yourself, "Why do I buy insurance?" Well, because you want to protect yourself against catastrophic losses. By catastrophic, I mean a loss that so large (your house; a lawsuit when your pit bull rips some 8-year-old's face off) that you utterly can't afford it. Thus, insurance plays the probabilities. It's unlikely that YOUR house will burn down, but likely that out of a population of 1,000,000 customers that SOMEONE'S house will burn down, so the insurance company aggregates the risk and you transfer your catastrophic risk to them for $800/year.
Okay then.... A "warranty" does essentially the same thing. But in this case the probabilities work against you. What are the chances that you'll have a covered repair that will seriously impact your personal finances if you have to pay for it yourself? The answer is "Not especially likely". Therefore, you're far better off, in the long run, by self-insuring against a high-cost repair. Take what you would have paid for insurance and put it in a Repair Account. You'll end up many $$ ahead. An extra advantage you have here too is that some of the probability of encountering an expensive repair is IN YOUR HANDS. That's called Routine Maintenance. It's also being attuned to the operation and characteristics of your vehicle and investigating/addressing small anomalies before they become BIG EXPENSES. IOW, if you don't neglect or ignore your car, you greatly reduce the risk to your wallet.