I'm mostly familiar with animal feed, where nutritional quality weighs quite heavy during selection. For human consumption I assume there are some base nutritional standards when applying to enter the market with a new breed, but might heavily depend on your region.
Plant breeders have also been busy reducing bitterness/tannins in various vegetables like brussel sprouts and canola oil, so things are in fact less bitter than 30 years ago.
I'm mostly familiar with animal feed, where nutritional quality weighs quite heavy during selection. For human consumption I assume there are some base nutritional standards when applying to enter the market with a new breed, but might heavily depend on your region.