When you are replacing these parts, the car is already used half way toward its lifetime. So most of the time your car is worn before you need these parts again.
Then you have the "for original owner only" policy that tends to eliminate 80% of all claims.
Then you have the 2x price premium over the same parts and labor in an independent shop.
For the remaining 1% of the customers, sure, no big deal.
I filed a claim on my lifetime warranty on the autobarn radiator. The service rep told me to do a pressure test before he will send me a replacement, and said it is usually free. My mechanic say $70 since I didn't buy or install the radiator there (fair enough), and the service rep budged. He let me send in my radiator at their cost, wait for their inspection, then send me a replacement. My car was down for 10 days, and if I didn't have a spare car I would have given up and get a replacement locally.
That's how warranty and insurance work: bad deal for most people and don't fuzz about the occasional payout. Don't expect to benefit from it unless you have more time and patience than them.