I feel the pain, and feel that the diffs should be more reliable, last longer as well. However, I would point out, that anyone who buys a true 4wd vehicle, expressly designed to be used and abused off road, no matter the manufacturer fully expects such repairs as differentials, u-joints and the like.
My primary gripe would be more like, improve the bearings, make parts available, and make the u-joints replaceable. These "whole unit" replacements drive the cost of ownership through the roof.
The fact that, while there as a strongly loyal audience, the company should take heed, and address the common failure items and strive to make the vehicle more reliable. For the most part, the majority of failures are more related the harsher environments I would not, such as the Northeast.
The fact of the matter is, whether we like it or not, all dealers strive to sell cars, not for the profit in selling cars, but for the profit in selling parts and service. As we all know, to that end, engineers design them that way as well. Who here would disagree, that they can predict within 1000 miles of exactly when a particular part will fail under a precise set of conditions. You bet, they can take that to the bank. Our mission is to find better ways to keep the costs down, and improve what we can.
Now, a case in point, that LR might actually be listening or learning, I recently replace my hood struts, as one failed. I figured the other wasn't far behind. When the new ones arrived, they where substantially more stout than the original ones. As it turns out, only one was bad, anyone need a working original hood strut? One new one will support the hood by itself, one of the old ones would not support the hood.
Parts and rebuilds are available for a lot of stuff LR, as a build of it was OEM to someone else. I am trying to collect some old parts from folks for dissection.
PM me for Diff rebuild Parts, hitches