People demanding quality and having money for it do spend $3 million on Prevosts so raising price of today's camper "design to rot" from $60,000 to $65,000 to make it lasting should not be a problem.
IMHO it is the customer who forces the build.
Looking at RV buyers want fancy TV, satellite, stereo and kitchen island, but don't ask a question about structural integrity.
When TC is only cargo during travel, all the low and mid-priced motorhomes are build the same way.
That makes them death trap in case of any accident, but who really cares?