Because it's meant to be a SUPER. A moment where your Light is pure Asskickery. One shot to the head? Are you serious? Just die, re-spawn, and go use your super in turn. It's the way of the Crucible. As a Voidwalker main I can get begin a tweak or two to get the Nova Warp toned down a bit. Maybe tank less damage. Then again Arcstriders slammed PvP after their buff lol