Giltonio_Santos
Hero
Maybe I played too much card games but that doesn't sit well with me (...)
It doesn't sit well with you because it's an absurd statement. Unless you're implementing a house rule where characters gain exhaustion levels for making too many attacks, no amount of healing can win you a fight.
In fact, because of the way 5e works in regard to death and dying rules, I'd say the optimal choice is to only heal characters if they fall or if they risk losing something on falling (like rage or concentration).
For healing to be as effective as damage, it would have to go a very long way from where it stands now, where the same 1st-level cleric spell slot can inflict 3d10 necrotic or heal 1d8 + ability mod.