Why is a “main” game loop necessary for developing a game?

Question

I find that most game development requires a main game loop, but I don\'t know why it\'s necessary. Couldn\'t we implement an event listener and respond to every user action

Answer 1

It's not true that all kind of games require a dedicated main game loop.

Action games need such a loop due to frequent object updates and game input precision.

On the other hand, I implemented a minesweeper game and I used window
messages for the notifications.