It's a little ambiguous, but it sounds like your training is carefully crafted double speak.
Performance parts--like lifts--come with no useful warranty. At most, the parts themselves are warrantied against defects and your dealer warranties the labor. The same would be true regarding any manufacturer and parts installer, such as a reputable 4x4 shop. Nobody--and I mean nobody--warranties the impact of the lift on the jeep.
Thus, 4" mopar dealer installed lift cooks your driveshaft? Too bad. 37" dealer installed tires warp your ball joints? Tough. I've heard of folks getting those items repaired "under warranty" (like Green Machine and his 3 driveshafts), but it's done with a wink and a nod from a cool guy in the service department, and has nothing to do with the damage actually being "under warranty."
There is no upside whatsoever to getting a Mopar lift installed by a dealer.