There is a distinct feel among some folks that the manufacturers should use only the best available products in their TTs. That is like saying we should all drive a Rolls Royce and tow with Mac truck.
As for the vast profits made in the industry; that explains why many of the RV industries fell like dominoes, until rescued by Thor and Buffet. They had the resources to ride out the down times.
Even the folks at Jayco had better things to do with their half billion than keep it in the RV industry.
The TT industry sells what the bulk of the public will pay for. Those who have special requirements find those companies willing to build it.