Add Redoxx and Travelpro for the Platinum series.
Andiamo had it for the Bravo and Valoroso series before they went under and Pathfinder had it for their top series.
Tumi once had it but doesn't officially have it anymore. Yet I hear they are really good about it and still honor the old agreement even though it is not explicit anymore.
The point is rather how a company can be so generous with the warranty, not why so few companies aren't generous.
The other point is that for carry-on luggage which is mostly in your care, the warranty is less important. For luggage with wheels, extension handles and that gets checked, it is much more important. But even for carry-on luggage, I see people pulling overpacked 22 inchers up and down stairs by the extension handle (mostly women which is likely a combination of overpacking and not enough muscle to carry it) and then they wonder why their luggage doesn't hold up.
Till