Interestingly enough consumers drove the market for tasteless tomatoes. customers bought more tomatoes that were more brightly colored and more round, which drove selection for these characteristics
Producers want to sell more, therefore they select varieties that look pretty, that are uniform in color and shape, they will also select varieties that keep for a long time for transport, or that grow bigger and ripen faster for better yields, being measured only by weight. Lots of factors but none related to taste or nutritional value. The consumer has very little say in all this.
Hmm, maybe because they can't select for taste? If it was possible to get sample of tomatoes or other vegetables before buying, maybe things would change?