I'd generally agree, but Briggs & Riley seems to be the exception. Lifetime no hassle warranty. You don't need a proof of purchase (strangely, they accept the fact that you have the bag as proof that you own their bag), no shipping (just drop it anywhere that sells it), and they don't exclude wear and tear or damage done by airline. In fact there are no exclusions. They won't clean your luggage for cosmetic reasons, but they will fix zippers, wheels, worn fabric, for the life of your bag, whoever owns it. The only reason I've ever replaced pieces was to get a lighter bag or one that serves a different need. My rolling duffel is excellent for international travel. Rolling suit bag will be my next purchase. As you can imagine it aint cheap, but it's competitive with companies that do much less (Tumi, Victorinox, etc.)
I have briggws and riley and tumi. both are really good value.