Being prolific is not the only characteristic that the researchers are looking for in a variety. It should also be resistant to diseases like bacterial wilt, viruses and others. It should also be resistant to stress like drought. It should have eating quality that is acceptable to consumers. It should be suitable for year-round planting, and so on.
The above are just some of the qualities that plant breeders are looking for in a variety that they want to develop for commercial planting.