If factories were to take finished RV's on shake down "cruises" like is done with ships you could easily add "5 figures" to the cost.
Instead of adding substantial amounts of cost to the product up front, they provide a Warranty.
FWIW, getting problems fixed under warranty, even small ones you might just say "***-it, I'll do it myself", help improve the product over time as the factory can track the items that are the largest problems. If they don't hear about problems and have a way to analyze the causes it's just business as usual.
Vehicle manufacturers have been doing this for decades and over time their product has improved greatly.
As for all the griping that goes on in forum discussions, factories don't follow them for obvious reasons. Too large a credibility gap due to the number of people who relate stories they have merely heard "around the campfire". Far different than a DOCUMENTED warranty claim.
"A wise man can change his mind. A fool never will."
"Sometimes you're the dog, sometimes you're the tree"
2018 Flagstaff Micro Lite 25BDS
2004 Nissan Titan