I still dislike they way you're going. Champion is a warrior, he wears heavy armor and should have a lot of health, basically there is no difference between warrior and knight, both wears heavy armor and both should be healthy, the only difference between a knight and warrior is that knight does less damage but has a shield that increases his protection, warrior has a heavy weapon that slices everything in it's path so I don't see a reason why champion and knight can't have a same amount of health.
I agree that they both come from the same cut of cloth, where they both want to wear heavier armor than most.
But I have to disagree that they are the same and the only difference is the shield.
Warriors train in the tactics of offensive strategies, how to overcome an opponent and defeat them. That kind of mentality, you're not necessarily thinking of your personal safety than you are how to defeat your opponent.
Knights train in the tactics of defensive strategies, how to protect something, disable their opponent so they are rendered unable to pose as a threat. That kind of mentality, you want to be sure that you're able to survive for as long as possible, while protecting your objective.
From all I've ever read and witnessed from history, even from personal experience, no matter the situation, it's always been strategically more difficult to defend than to be the aggressor and because of that, the defender generally reinforces themselves in all manners they can. So, more health for the Knight is a perfectly natural thing.
That's not the only problem, in Leonis most tanks are Champs, so if they won't be tanky anymore then who will do the tank role in dungeons? It will be extremely hard to find a tank for dungeon. If they are going to apply this update then we will have only 1 tank class and lots of damage dealers. Also it will be harder for damage dealer to find a party since we have such a high choice for damage dealers.
And that's wrong, that Champions are the tanks, because that's not their role. And there will be two tank classes, the Clerics were showing to be very sturdy last night during some play time. It was quite impressive to see, but they also built themselves to be so. Their only downside was they don't have a taunt to take the attention of a target, but they have the ability to heal and support otherwise, if built to do so.