Some of the problem is the incessant quest for every tenth of a mile per gallon thanks to CAFE standards. Shutting off the alternator saves a tiny amount of horsepower load on the engine but costs some owners multiple batteries.
Lower front air dams that get caught on and ripped off from parking lot (concrete) stops, tailgate top extensions which force the redesign of canopy toppers (adding to cost and preventing a good seal from water), everything that is redesigned to add mpg’s seems to end up costing the owner more money for other issues. Part of the reason we have$75K+ trucks now.
I don’t even want to think of what the cost is to rebuild GM and Ferd’s 10 speed transmissions. Our ZF 8 speed will be expensive enough.