The reviewers know what they like. If you like that thing too, you go get that. If you don't like that thing, you don't have to purchase it. Their tastes are just as superficial as fans of a sports team or movie franchise.
I absolve you of the need to like the things that rich people like, if that helps. There's nothing there to be kept out of. There are plenty of foods to like in the world, and if the sneering of fancy restaurant critics bothers you, you have my permission to flip them the bird. Preferably a free-range heritage breed bird.
This is simply not true. Numerous Michelin-starred restaurants offer relatively simple food. The most famous example is perhaps Liao Fan Hawker Chan, who serves mostly chicken and rice with soy sauce.
this seems more like what people think about "fancy cooking" than the reality. if a chef has used mushrooms in a dish it's not because they want to get the glutamates the hard way, it's because the mushrooms have other flavours and textures that they wanted to incorporate into the overall dish. if all they wanted from the mushroom was the msg they would have used msg.
