I guess there are multiple answers to your question.
A poorly speced truck would be on built totally wrong for any application.
When one buys a cookie cutter truck it may be better for the guy hauling 800 lb loads east of the Mississippi vs the guy that starts out his week with 14,000# of magazines from Chicago to Sacramento.
If you've come out of a truck with leather , swivel, two armrest seats, into a $250,000 truck with non-swivel, cloth seats ,you may think what crappy specs every time you sit in the truck.
How happy will you be if you pucker-up at every scale because the front axle isn't as stout as you require ?
Or the dealer uses body company A over body company B, which you feel is a superior body ?
I've driven 3 expedite trucks I didn't own. All relatively decent trucks. None had my preferred brand of liftgate.
Every time I used the other liftgate I cussed under my breath about someone specing a different liftgate to save a few hundred dollars.
I've seen choices made that I question. Axle size, tire size, axle placement. Major components I wouldn't choose. Those are just personal preference
I was alerted to a dealer that had a new unit in stock that had a bodybuilder sticker warning that the body was not built to withstand forklift useage.
Did this dealer skimp on this body, saving a few hundred dollars, to increase his profit by eliminating a necessary upgrade that many would overlook ? Would that sticker be removed during the PDI ?
Who would buy a $250,000 truck that wasn't built to handle a forklift ?