Anything requiring skills may require a lifetime to be perfected, that includes making a burger.

But that doesn't make dishes or a cuisine sophisticated per se.

To me sophistication requires knowledge and mastery even if you need to make a very basic and the result is not good, think of a beef Welligton or roast beef or a soup d'onion.

Those are all much more complex dishes than making a pizza, they require more work, more ingredients, more time, more preparations.