Why are manufactured homes not more popular in American cities with very inflated housing prices? I read that they are unpopular because the cost per square foo

Why are manufactured homes not more popular in American cities with very inflated housing prices? I read that they are unpopular because the cost per square foot is actually more than stick-built, but that is for the average cost around the country. In an inflated market, I would expect buying a vacant lot and putting a really nice manufactured home on it would be vastly cheaper than buying an existing house, and much quicker than waiting for a contractor to have a schedule opening.