User blog comment:Lukeatlook/Pyro's Item Overhaul 7 - The Tank Project/@comment-8468980-20141221193529

the basic problem of support tank itemization is that many things that they like on items are also things that bruiser / tanky dps / tanky fighters like. This is a problem because bruisers can snowball off of kills and scale with damage, forcing items that support tanks would otherwise want to be more expensive without neccessarily having equal means to buy these items.

The way riot has tried to solve this problem is by adding more support-centric features to these items, things that benefit your team more. Cutting Aegis' selfish stats but enhancing it's ability to block aoe burst as well as creating Righteous Glory are two examples of Riot trying to create support tank options that don't buff the bruiser class.

I think your ideas are very interesting and obviously you put a ton of thought into this but many are flat buffs to a large group of champs that simply do not need the added power.