I get the brand loyalty thing... I'm likely to consider Jeep and other FCA models first over other brands. Some generations of a model turn out better than others, I did skip the '05-10 WK GC generation for the styling and the interior...I remember looking at them when they first came out and thought the front was odd with the headlight bumps in the hood and the interior was cheap and nasty compared to my WJ, so I kept my WJ..
Actually, they never did -- to their own detriment.
The point really isn't "high powered" V8s. The point is to ask yourself what power you need for a given application and how to most economically, reliably and efficiently produce it. At 400, 300 and 200 hp naturally aspirated, the 5.3L V8 4.0L V6and 2.7L I4 fits into the applications perfectly. A 600 hp bi-turbo is also ideal for flagship luxury cars and SUVs. You can make all that with a smaller architecture than already very small and compact small block.
The problem with DOHC designs is that there is practically NO ADVANTAGE to them. You do not need the additional flow capabilities of 4-valves per cylinder at 6000 rpm and you don't want a 9,000 rpm engine in a Malibu or Escalade. So, essentially you are paying 4 times as many camshafts, twice as many valves and lifters, more internal friction, more things to break, more things to cost more money, much heavier and bulkier heads, all for what? ABSOLUTELY no benefit.
Look... I drive an Audi with the 4.0T. I know all about its overly complicated 4.0L hot vee engine with buried oil screens, cracking PCV system, vibrating downpipes, exploding turbos and the 435 hp / 445 lb-ft it makes. Yeah, that's LS1 territory at 25% more engine mass. I get 16-18 mpg out of it in daily driving so, no it is not really more efficient -- in part because V4 mode basically do not kick in much except when you are steady at 65 on cruise control with no gradient because 2.0L off boost really isn't much. BTW, this engine only revs to 6000 rpm (5,400 when cold) so what is the point of DOHC 4-valves when we know that pushrod 2-valves flows enough air for 80 hp/L at power peaks up to 6450 rpm (LT2)?
^ I get you now; that a consumer's strong loyalty can overlook an 'ugly' generation. It's possible, sure.
CarGurus did a survey of truck owners in '18. Only 29% said they would not change brands for any reason.
Coupled with the fact that Silverado sales were only off 1.7%, loyalty doesn't seem remotely to be the factor there (If 71% WOULD change brands for one reason or another).