Lol premium butter chicken? It's a one pot curry, basic knowlege and chuck stuff in, has no fancy ingredients (though some if not via e.g. hello fresh can be difficult to find like fresh fenugreek leaves).

Anyway.
I can guarantee good quality and properly done fish and chips is much harder to cook, especially multiple portions, than a huge range of Indian food. But with a recipe - without guidance people would definitely struggle to get Indian food right. But no quality of recipe can get a mediocre cook to consistently do fish and chips perfectly. Also eeew having any fresh fish from any kind of central wholesale and certainly not in sushi :S