I have multiple recipes for soup that include zucchini (courgette) that are all at least 30-40 years old, and all of them seem to have you add the zucchini late in the cooking time, as if the zucchini needs to be treated gently. But my experience is that zucchini needs to be cooked with no uncertain vigor, and I will generally add it earlier/cook it longer.
Question is: are “modern” US supermarket zucchini substantially different from those of the past, perhaps in the same way that science has given us hard, flavorless supermarket tomatoes — or do I just prefer softer zucchini than these cookbook authors?