User blog comment:PurpleWii/The Evolution of the Tank archetype./@comment-4091261-20160425195544/@comment-28230442-20160427145949

'You know how a great majority of these fighters also have the category as tank? Well that said, it is perfectly possible for subcategories in both classes to mix and match.'

Yup! I agree! When you put it that way, Champions like can be considered Wardens as well.

'The issue I mainly see is there are very few items that Wardens use that Vanguards can't use effectively. All the items that Wardens use exclusively are support items.'

I know where you're coming from, but I feel that's kinda how it's going to be. Those items; and  are more about the actives/auras, but less about the raw stats, which makes them fine items for supports, but sub-optimal ones for Solo lane Tanks. I could imagine if the item you suggested went through, it would fall into the same category as the items above because of how strong its active would be.