Interesting post indeed! the genetics play an important role in nutrion (as well as in flavor, can't forget that) but the reason why humanity has been doing this selection over centuries is mainly to improve the productivity as you say, not taking into account the fact that in the long term we are harming the ecosystem and its diversity... it would be nice to see a complete research on this matter (the harm of this process in the long term and its consequences). Keep the good job!