Should Swain have his auto-attack and last-hitting buffed?

Been picking up Swain again recently, and it's frusutrating trying to last-hit with him. It's slow, has low damage, and I keep flubbing last hits by tiny amounts of health. I even made a rune page with flat AD instead of flat AP and keep missing hits. -_-

I know at one point Swains auto-attack was tuned to keep his passive's sustain in check, but I really don't see the relevance of that in the current game state of manaless mids all over the place.