Apples and oranges.
The Sprinter, Power Wagon, Super Duty, and Yota (really, isn't the TRD Pro stuff just a tape and stripe kit with better shocks?) are completely different classes of vehicle and don't have the same restraints for economy, crash standards, etc. That's about as accurate as saying if a Peterbuilt can get 6 mpg why can't a Honda?
The G is comparable by class (i.e. both SUVs) but not by market. The G is near double the price and would more compete with the Defender than a Disco. Again, a hard comparison.
The Wrangler is also in the same class in that it's an SUV and is actually priced below the Disco5. But again, a different market than the Disco which would be closer to the GC. I have written repeatedly here and other places about how I'd like to see the next Defender go toe-to-toe with a Rubi in terms of technical terrain capability but retain more cargo capacity and stay within about $10K of the Rubi - Say $50K. I'm not holding my breath but that's what I'd like.
I'm not saying I wouldn't want to have the things you talk about. Smaller wheels/bigger tires; less gimmicks and doo-dads to drive up price and weight while adding complexity; I don't need 550 hp for an off-road rig; I don't want 7 seats; I want a more basic platform that i can built to my taste. But that's not what the market (and the EPA, NTSC, etc) demand in this class vehicle. It's better than most of it's competitors but doesn't go as far as we would like. Like every major change before it, I suspect we'll come to appreciate it more with time. And for now we remain hopeful that they'll do the Defender justice when it arrives.
I'm guessing you must daily a Series, right? As everything else would be too soft and complete crap. You seem extremely angry, like somebody ran over your dog. Maybe you should have a Snickers.