Staggering Impact is not a must for warband play. NOTHING 2H knight brings is a must for wb play. It's quaint to have the wounds and crit debuff; ocassionally you'll run one knight, who's probably well geared and friends with the wb leader. Prior to the Vigilance change you did have specialised 6-mans that did run 2H knight in warbands (Secrets and Matt come to mind), but from that to calling it a "must" is just gibberish.
When push comes to shove, most warbands will pick any SnB tank over a 2H knight; and for good reason.
Your 10% (defendable) defense debuff is not that important. Any Engineer (and lord knows we have enough of them) can cover that debuff and more, while also doing *gasp* damage. Look up Pierce Defenses. That debuff happens on target defense; meaning if the target is
in need of a defense debuff, it will get one, without wasting a tank slot or a global cooldown. You are literally bringing the warband down by not just putting on SnB and guarding an Engineer with Pierce Defenses (hell, even SW have Pierce Defenses; do you realise how much defense piercing order has????)/
At the end of the day, we have on one side people who realise that, no matter what 2H spec you run for smallscale/scenarios, Overpowering Swing is where it stops in Conquest tree, and on the other hand... detrap, who runs 2H in warbands.
