I think you're kinda missing his point. Templars will benefit FAR more than a dekan. I agree templars will still remain the most potent force, but their weakness should be a lack of HP. 50% on top of everything is kinda OP. However - It is still a SMALL weakness. Why? Well we have Attack%, int, DD, Attack speed % and only 1 extra option. This means it's going to be 50% hp. No more extra HP absorb or mobi. Not much of a weakness... but yea.
Your argument about DK's is invalid. They have two nukes - a minor and a major. Every 17 seconds they're going to deal about 60k damage. Match that to a templar's 60k damage across 6-8 seconds. Difference? DK can tank. You also gotta remember templars are like "steady" dps (but still OP). Dekans are nukers. They're meant to finish off targets.