Everything you're saying can be true. But have you ever actually used it like that? Your team might be unkillable, but the other team either won't get into a fight that they know they'll lose or just super your bubble. Nobody will go primary to primary when the other person has a bubble. Suppressor grenades are situational and very difficult to use effectively, while other grenades are up every life, or you can carry two. Bolt grenades almost guarantee a kill every life. If you're popping your bubble where you can snipe the other team, you're using it wrong and likely won't get any kills. Yes, you can pop your bubble in time to stop a rocket... One rocket. If you step outside your bubble after that you're pretty much dead, and the other team likely has a super to counter. Don't bring a machine gun to a rocket fight, kiddos