What do you think about the argument that in wine there is just one ingredient, still no real wine connoisseur would claim that there is narrow spectrum of wine

What do you think about the argument that in wine there is just one ingredient, still no real wine connoisseur would claim that there is narrow spectrum of wines. Same for beer, there are countless varieties of hops, malts and yeasts and by combining them and using different temperatures, brew durations and a multitude of other parameters you could still achieve a wide variety of different flavours that one could probably never try all of them in a lifetime. I my view the "Reinheitsgebot" as it is called is just a way to ensure that this is a basic product where everybody knows what's inside, so more of a quality standard than a taste standard.