Morels cannot use wind nearly as effectively. In other words, the use of ascospores by the morel was not a result of advantageous evolution but a disadvantageous carry-over from a yeast. Creating a practical growing procedure for morels has been a long term task in science. The first assumption is that they should do what other mushrooms do. They do not, because they are nothing like other mushrooms.
Mushrooms are usually decay organisms.
They produce enzymes on the surface of the mycelium for breaking down large molecules. Morels do not, except perhaps for attacking some polysaccharides, as yeasts do. Mushrooms are usually quite ancient in their evolution, which makes them hardy and easy to handle, as difficult as mushrooms can be to handle. Morels are in the infancy of their evolution, which makes them very fragile to handle. But there is more than recent evolution to the difficulties in controlling the growth of morels.