I would rather we all earn our kills fairly when the only objective of this game mode is to - get kills
Also those Sigils buff proc set damage. Stacked proc set builds can oneshot fully shieldstacked Mag builds or full health Stam builds if they do it right. There's a serious balance issue if at any point you can oneshot all but the most tanky builds.
It is a poorly thought out element. Sure, if the team that was getting destroyed could guarantee getting it... maybe... but the reality is that the dominating team generally winds up getting the buff...