Exactly, Autozone's "lifetime warranty" is a joke among those who know what it really is. It's genius in that it gives the illusion of great quality... afterall, how could they afford a lifetime warranty on cheap low quality parts that don't last.
The genius is that they know that once a customer buys something like a radiator, their vehicle is getting old enough that few keep it long enough to need that free replacement. In reality they don't have to provide many warranty replacements so the cost of that "lifetime warranty" is actually very insignificant. It's more just a great marketing tool that fools a lot of people into believing it indicates good quality when it's not in reality.
For us Jeep owners that tend to keep our Jeeps longer than average, it just means we'll have to replace a Duralast radiator more often than we'd like or expect to. And the last thing I want to be wondering about when I'm 40 miles from town out in the boondocks is if that cheap critical part is going to fail when I'm out in the boondocks. A cheap critical part that fails in town close to home is one thing, being in the boondocks when it happens is quite another.
For my Jeep I'll never, ever, install a cheap critical part like something with the Duralast brand on it. It's just not worth the savings. At least not to me. Like the pilot 10,000' up at night over the mountains when his engine starts sputtering and he starts regretting that cheap magneto he installed.
I'll take a 12 month warranty on a Mopar radiator any day over a lifetime warranty on a Duralast or similar low-quality radiator or similar critical component. Duralast floor mats? No problem.