I’m sure that since there are essentially zero pigments in Goldens, they would be lower in some phytonutrients. But nobody bred all the healthy compounds out. Golden was a chance seedling that someone decided to propagate.

Modern breeding programs that focus on cold hardiness (U of MN), disease resistance (Perdue-Rutgers-Illinois, Czech Republic), eating quality (all of them) are not focusing on producing varieties that are more nutrient dense. But nobody is purposefully breeding the nutrition out!

Drifting towards sweetness might be problem. But I still think that a greater public health problem is that most people in developed countries are eating highly refined and processed foods.