Geepers, no kidding?!?!? I bought a 1991 YJ new going on 14 years ago this summer. Within a year, I was snapping U-Joints and trying to get everything out of it that I could! Over time, we want to upgrade the heck out of our rigs to meet our new desires and expectations. I wouldn't mind having a Dana 60 setup, I wouldn't mind having good flex, I wouldn't mind having a lot of things for my Jeep, but they don't build them with all these things because of two factors. Cost and safety. The reason why MOPAR put the side mirrors on the doors is because of state laws requiring you to have two mounted mirrors on. The one on the windshield and one on either side or just on the sides. Safety, they try to keep your doors on by keeping you legal with the mirrors. Simple example. Another, The windshield to roll bar "bars".. They have break away bolts on the windshield frame and tamper-proof torx on the roll bar end. They come with the bumper things and even the tie-down point on the hood and the strap on the windshield frame to lower your windshield down, but they put those bolts on that are a pain to take out and if you break the bolts getting them off, you have a lot of work that you have to do.... This all a safety thing, sure you can take your windshield down like an old Jeep, but it isn't easy, MOPAR's safety attempts.
Cost. If you put a pair of Dana 60s or 70s on a Wrangler at the factory, how much of a price jump do you think there would be? I'd say a couple grand easy as you wouldn't have any reason to put them between the wheels when you have a 2.5 L engine in there? Yea, going to have to go with a 4.0 or better, then transmission, then transfer case, then beef up the frame even more to handle the torque....

So, there are obvious reasons why Jeeps don't come with V-10 engines and 47 inch tires.... Most of us live in places where there are laws that govern how high your bumper can be, or how far your tires can stick out. I'd bet that 1 out of 500 Jeep owners actually upgrade everything where 1 in 100 really want to and 1 in 10 think about it because it looks cool. If a Wrangler came with everything that the advanced Jeep owner would want in their rig, it would cost a fortune. If Jeep made them standard with all the gadgets and beefed up gear, they would only sell about 10% of their stock! Cost and safety....