That's what i've been arguing for a while. Anything really....big, should only be used as centerpieces.
Every species should have super weapon? Some races don't have militaries, let alone a planet killer.
And wouldn't each civilizations armies and airforce be constructed differently?
To keep it balanced I think that it SHOULD be possible to wipe a planet out, but you cant just push a button; it has to be manual. Kind of like how we could do stuff like Hiroshima with conventional explosives but it was a lot less efficient.
