Even in this day of the internet's access to information, well-tuned, performance or stock engine builds rarely have the proper tune to maximize drivability, efficiency and performance.
I've found that nearly 90+% of the people who's modified cars I've driven or ridden in are not properly tuned, and suffer from reduced drivability, less than optimal performance and poor mileage. It's not surprising that people want to attempt to improve those conditions by switching back to stock. However, even when stock motors are installed, the majority of cars are tuned incorrectly still, ie set to the factory specs.
Life is to short to drive a bone stock Mopar set-to factory specs.