User blog comment:ClariS/My Champion Remake: Kayle/@comment-4636093-20120406091753

Shields and heals are those 'clutch saves' making them take less damage (but still some) does not feel like a save even if it does save them.

"Shen ulted me at 3 HP and now I survived." Is a lot more savey than "Galio gave me a defence boost at 300hp and I lived with 3."

Armour and MR boosts are lackluster support options easily countered by a Last Whisper or Void Staff.