Why not rework heal to make it a bit different from Barrier

My suggestion is why not make heal work like a Potion you press heal and over 3 seconds you recover some HP

New Heal: Restores 30 - 285 [15 + (15 * level)] instantly and 5% Max HP over 3 seconds

So you get some HP upfront and other part based on your Max HP over 3 secs Heal is a bit weaker now on low HP dudes but a bit better for HP stacking dudes like Leona or Braum and Barrier can be used for ADcarries now again so it sees play

Or you can merge Heal and Barrier if you are Full HP or almost full if the Heal overflows you get the rest as a Shield. What do you think?