So as far as I got it, laners were abusing the support items for extra income.
The current health nerf is not in relation to that but becuase of the domination of tank supports in the current meta (don't ask me about my opinion). The abuse cases is something different that is going to be looked at within the next 2 or 3 patches.
And to change that RIOT... made the first tiers of the items even MORE valuable by giving them free wards
Nope. They changed it because support players wanted to have better ability to opt into real items rather then the sight stone. Both things don't have anything to do with each other.
while just deleting the Tier 3 versions that non-supports never bothered with anyway?
They were going to bring back these items in form of full items. Twin shadows is already back on PBE, shurelia#s reverie is next and (most likely) old FotM somewhen later.
Please don't confuse different aspects of support changes with missing context. It is not the way you thought it is.