Dorans Shield Identity
I actually did try buffing Doran's Shield in this pass. The results I got was mostly certain characters were shut out rather than defensive items being stronger - due to the fact that Doran's Shield's main identity is basic attack reduction.
There's probably a change that can buff it without unduly hurting the item - but at this point, the identity of the item is most likely flawed (or perhaps, made flawed by the fact that we want other patterns to exist.)
If the identity is too negative, can we tweak the item such that it applies specifically to taking damage from ranged as a melee? Weaken the current effect by a degree, with an additional passive such as the below
Arrow-B-Gone: (Melee Only): The blocking effect of Dorans Shield is doubled against enemy ranged champions.
That would change the identity of the dorans shield to be a defensive item that specifically helps block harass as a melee against enemies that are ranged, such as when you are Shen v a Teemo or Vayne top, without warping the matchup in melee V melee matches.