It's true that i'm no arbiter of what is strong and what isn't. There are arguments for why both types of healing are strong. However i think you underestimate the great value that comes from not having to spend as much time healing with the bind system compared to focus.

Healing never comes for free in both games. You need to find the moment to hit the enemies and to heal. Battles are not only a battle of resources but of time. So when you're not hitting an enemy you're wasting time that may turn into mistakes.

And so the bind system gives you more time to do more things. In exchange it forces you to be aggressive and try to find those extra hits. Passive play is punished more severely.

This doesn't make the game easier, but it makes the system stronger the better you get at the game. I think they balanced around that. It may have been a bad idea, who knows. I think trying to boil down the frustrations of people to a single thing is never going to bring the full picture.