Hence the saying "you gotta pay to play"
And yes there are lots of guys who void their warranty to tune their trucks.
People tune for their own reasons...so each to their own.
If you drive them in a normal manner, you can have a more reliable truck than the stock version with all the potential problems with the emissions equipment....plus your mileage will be much better.
I never had to take my 2008 6.4 to the dealer once in the 6 yrs I owned it, with it being deleted and tuned the whole time.
I had it a week before i tuned it (i bought it used with 18k miles on it).
The mileage i got running empty stock, was what i then got pulling my 33 ft toy hauler tuned.
Sold it with 60,000 miles on it; no issues at all.
I had my stock 2012 6.7 a month before the heater in the DEF tank went and i had to get it replaced at the dealership.
My 2015 King Ranch has so far been trouble free in stock form. But if i decide to keep it a few more years I'll most likely tune it as it just seems so gutless compared to my old 6.4