Thats an interesting take. Its an EarthTalk article, not an actual SciAm. I wouldn't doubt that it has some truth though. Mostly thought its attributed to the reasons I listed, though the ones cited in the article are certainly factors as well. ( especially pest resistance )

The bottom line though, is none are bred for nutrition.

One tip though for healthy eating - broccoli for some reason bucks the trend, and is generally your best bang for buck regarding good nutrition. For whatever reason, broccoli maintains stable levels of nutrition across genetics and growing methods.

I have an advantage here though, actually working in the industry.

For who could be free when every other man's humour might domineer over him? - John Locke (2nd Treatise, sect 57)