I wouldn't judge it too hard before actually getting your hands on it. Nobody yet knows the weight, it's impact force, etc. If it's really light you could maybe use it on field.
It's an interesting item that could serve a purpose. Perhaps not against other players but as a milsim prop this thing is pretty neat. Capture a mortar position and have the players fire off mortars vs an imaginary force or against an unoccupied building?. Wouldn't that be super fun?