That’s not how most maps work?
Very few maps have a decent vantage point that also offers protection as well as healing.
Ana’s “range” is more of a hindrance than anything; Ana is already super greedy with her abilities since she HAS to use them to stay alive, and now she has to take away from the other supports, or the team to be justified.
Also Zen? Moira? Brigitte? Lucio? They all have kits and tools to either dissuade being jumped, mobility to escape, or stun’s and knockback to turn the tide. None of which come anywhere NEAR Ana’s SINGLE target CC’s cooldown.
She on average heals 3000 less hp than Mercy, her mobility is worse than Zen’s, and she literally has no escape?
She has WAY more trade offs than ANY other support in the game; there still needs to be a reason to bring an Ana to play.
Right now, Mercy and Moira can just ignore what keeps Ana so down. They don’t need to waste what utility they have keeping alive. They can ignore chip damage. They have the chance to escape bad situations. They have tools to change positions.
Ana needs a healing passive to be even THOUGHT of as balanced in the way the game has moved