AoE grenades are useful in PvE because AI aren't as smart as human players. In PvP they're only useful as a deterrent to a control point, not for DPS. Plus does an AoE grenade fit the Hunter? Swarm = Skip = Arc bolt = Scatter = Firebolt = Axiom. Tripmine = Fusion = Magnetic = Flux (Magnetic makes sense to have the most pull since it's magnetic and to balance the non offensive Defender. Fusion is lightning which produces static and attracts objects. Tripmine is balanced out by being able to set up a trap and has the most damage in PvE. However I've killed myself countless times.) Titan's don't have seeker grenades either. As I said, with modifications. I use all 3, it'd be boring if they all performed the same. Lore is important to me. It needs to feel natural.