Because every soldier, fixer, advy and keeper going into PVP aren't running in there with all the instance buffs running at the same time all the time ><. It's just Paper PVP here again. Just because you can show it can happen doesn't mean it does happen.
And no, it's not really F'ed that a onehander hit's 800 damage reg hits.... if you think that's GOOD, then you're delusional. I don't even know what you mean that 400 add damage doubles everything running. It's not doubling reg hits for anyone unless you have a min damage = 1 weapon (I don't see too many of those). That means it's not doubling fling or burst. FA and AS caps most people anyways so it don't matter. Where is this double damage?
Yes it has an effect, but it's certainly NOT doubling damage. Considering many profs are getting alot of perk damage, it's even LESS of their PVP damage that is affected. If the argument is boiling down to how it makes the onehander OPed, then it's not the instance buffs that need the nerf, it's the onehander. The add damage bit isn't what makes those instance buffs OPed.