I don't think it's entirely fair to say that about the drivetrain swaps. I mean I want to go EV eventually, tho the transmission back will all still probably be Jeep stuff, just with a different power source.
My biggest issue with the LS swaps is that people finally go to all the trouble to put in a "decent" engine, with multiport fuel injection and everything, yet they still chose a pushrod V8, based on a SBC. Like, at least do a SOHC or DOHC if you're gonna swap it. That's just my opinion there, I totally understand keeping it stock if it works fine, frankly that's the right answer (assuming you stick with combustion) both from an environmental and economical perspective, but when things DO break/wear out, I don't see a problem with putting a better drivetrain in.
Things like overdrive transmissions I can understand putting in, or if you're actually going to use the off-road stuff, whatever you need to go off road, only what you need.
TBH the mall crawlers are what really bother me. Invest all kinda of money and time in these big off road accessories, make it get 8 mpg if you're lucky, and then continue to drive it as a DD, w/o hitting the trails. Frankly a Subaru Outback is overkill for that kind of driving, let alone a real truck. I'll go more places with my stock SJ (rocking the 225/75r15 white walls) than they will with their crawlers.