Sure, if it’s “distant” it’s going to be difficult. Moira is powerful, but mostly within a range around her. On a highly airborne Pharah or “distant” Genji, she would be useless. That’s more of a playstyle, if the people who are flanking or playing far away from the team to get cheeky/non-cheeky kills.
Baptiste is more midrange/close range, and you can lob grenades away on the ground to mass heal when you have heroes that are more grounded. That’s why Ana is fine where she is. She isn’t going to get mass healing with her sniped shots, so she needs to make sure the healing is prioritized on those who need it.
As for airborne dps like pharah, I agree with the mercy buff, it would help out characters like Pharah. Now if your team is running a diving genji, even an Ana may not necessarily be always the best choice if there are shield-based comps, and a Zen orb on a genji will bring more utility (as it will on a flying pharah as well).
So it’s all about situational utility. All I am saying is that she doesn’t need a nerf, or a buff. She is good where she is. But definitely agree with the Mercy buff and Zen buffs, while I don’t play them much at all, I can empathize with their struggle to heal some times.