I do get what you mean: i.e. looking at a short timeframe (kill opportunity), class A bursts while our dots are just slowly ticking. Yes, the bursting class will lose more damage done here in absolute numbers.
But what I was getting at is, now there will be no combinations where our dot damage will be enough to EVER land a kill during those short time frames, and the fact that other classes won't be able to solo shit and cover our disadvantages makes it even worse for us. (Vast exaggerating, intended as example.)
What I am trying to say, is that this change in power will have a much more profound effect on classes like mages and warrior, whilst at the same time, it's a good boost to your survivability against melee setups. Besides, the problem with lock damage doesn't really stem from power. So all in all, this might as well be an indirect buff to locks (comparative to other classes).
I can see why you think this makes sense. I'll explain why it doesn't.
If you have too much damage already, and get a "minor" damage nerf chances are that this nerf won't affect your ability to be able to kill someone.
If you have too low damage and you get a "minor"(same % but I do understand how you think) damage nerf chances are that you will not be able to kill a target, as you barely were able prenerf.
I'm not saying I know anything about lockdamage, I really don't. But your logic isn't actually logic.
Dunno, if I explained it well enough - let me know.