What makes a great midfielder?

They say that the game is won in the midfield, but why do so many big games say this, what is the philosophy behind a great midfield, and how do the top managers in the world succeed in building a great midfield?

Madrid v Barca (26, October 2024)

Lack of pace and press from Mbappe caused Madrid to rely on Vinicius Junior and he pressed

Rodri winning Ballon D’or