Damage boost has been around since the game started and wasn’t ever considered a problem before the rework. More importantly - it doesn’t contribute as much as you think it does. A high rank Mercy damage boosts about 700- 1000 damage a game. A healing focused, yellow orb using, high rank Moira does about 6500 damage. An Ana does about 4500. Now, all of these damage types have advantages and disadvantages but the numbers are what they are.
Res is a form of burst healing. I think it was always meant to be viewed this way. However, I also think that res has to be removed. It’s causing too much trouble.
I’ve quantified these thing’s contributions in a previous post in case you’re interested. They don’t add nearly as much to her contribution as you make them out, and they’re lower than the aggression/utility other healers provide.
In any case, the devs absolutely should stick to her design. It’s a good design, and many people enjoy it very much. I know that you find her boring, and that you might dislike any character who is a “healbot”. But many of us do not. She’s the only character built to appeal to heal focused players, and she should stay heal focused.