Many vegetables today are either sweeter than their predecessors or less flavorful or both.

Corn, for instance, grows so fast under modern fertilizers that the internal cells split during the growth process.

Their stalks are weaker but their yield has more than doubled since the 80s.

If you want to learn more about that, I can highly recommend the book The omnivore's dilemma. It's fascinating how modern agriculture is so completely divorced from what most people think it is.