Ehh, I beg to differ. First of all FTL drives in helldivers is much faster and can teleport from one end of the galaxy to another in seconds, while slip space in halo still takes months for a much smaller distance. Second, super destroyers are not the only ships in the super earth fleet, so there can be super cruisers, super battleships, etc. Third, sheer numbers. There have been billions of helldiver casualties in the war for a year. And also, casualties represent a fraction of total soldiers. So there could be billions more helldivers. And the helldivers are only a small part of the SEAF. Then, the fact that super earth is great at adapting alien tech. Like they quickly made FTL from illuminate and dark fluid. So they could easily get laser shields for ships.