Tank Supports Items Need a Revaluation
IMO, I don't think support tanks (ST) have the option to carry. They don't have the gold, those items cost a boatload, and Sunfire/Thornmail/Deadman's don't do a lot to help your ADC in the laning phase. Conversely, Mage Support have an easier climb up to AP damage while having earlier items that support the ally in lane, and upgrde until useful items at mid/late game.
This is also troubling because both Top and Jungle seem allergic to tanks. Everyone wants a fighter. Which means if you give half a shit about team comp the support is forced to either take a tank or roll the dice. Something I personally and not the most thrilled with.
STs are also at something of a disadvantage because of runes. As a support mage, I can off-set Domination and take Ghost Ward which substantially upgrades my ward time, and vision on the map. To do this as a tank, I need to forego my Magical Footware, which only exacerbates the problem of money again. This made me realize that we're overvaluing tank items for what amounts to "not much." Maybe I'm alone in that but the tank items don't give me a ton of survival skill with the way ADCs are currently.
tl;dr - tank supports pay a lot of items that don't work well, and don't help lane opponents. Please add new items or change the costs of existing items.
has 200% health regen.

or
exist and further diminish the value of defenses. It also means for non-tanks, that their defenses barely do anything, unless they have active like
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