Originally Posted by crazy banana

There are many more factors to take into consideration while growing banana varieties on a large commercial scale besides the plants being disease resistant.
As a hobby grower I can experiment with different varieties. But as a commercial grower someone would want high yielding varieties with mostly uniform fruits.
Of course the bananas have to be tasty, but they are pretty much worthless for a commercial grower if they do not ship well or have an extremely short self life.
The recommended Namwah for example has a tendency to split if not harvested quick enough. Other varieties like the dwarf Brazilian usually have a thinner skin or easily break apart at the pedicels making them not necessarily a good supermarket banana.