Should you ever use a griddle attachment on a grill? Chefs advise on a cookout controversy

Flipping burgers on a griddle attachment on a grill.

A griddle attachment for a grill seems like a no-brainer. It makes it easier to cook breakfast ingredients like eggs and bacon.

However, if you think about it some more, it appears to be a waste of money. The obvious thought is that it cooks food in almost exactly the same way as a grill, so letting grill marketing manipulate you into buying yet another grill attachment seems like a bad move.