That's the Dev team's headache.
But honestly, Balance's buff would be replaced by Divination. There's the bloody standard buff that people wanted and now the other 6 cards can do something else.
HOW has many iterations some of which I said back in Shb:
- If we had Noct Sect we could toggle between the two: Half the cards in Diurnal, half in Nocturnal with one sect having the offensive cards and the other defensive.
- Keep with the idea of 3 different effects and split them between Melee and Ranged. Not ideal but a decent middle ground.
- Cards are now on a rotating wheel. When you press Draw/Play (however you wanna work it out) it stops on that card allowing you to mitigate RNG.
- You can Draw and then Hold a card, saving it for later. While being held the card in question is removed from the pool and you can then Draw from the remaining 5. More RNG mitigation (bonus points if you want to keep Redraw).
They had options. They chose to be lazy and take the easy way out.
RNG is part of the class and part of the fun of the class for many. If that isn't your cup of tea may I suggest the 3 other healers in the game?