Language, history and curiosities in games.
In fact, beginning designers often over-innovate.
A game without a metagame is like an idealized object in physics. It may be a useful construct but it doesn’t really exist.
If you don’t like a game that is popular, you should take responsibility for figuring out why people like it. Play with those people—watch them and understand that they are not wrong to like the game.
If left to my own devices , I will playtest a board game indefinitely.