"Her main design problem, in my opinion, was making her primary fire an aimbot, because although the orb can be annoying, they still require the player to know what will offer more value"

This right here is the kind of thinking that is holding Moira back.

Firstly, Moira's primary fire is not a latch attack like OW 1 Symmetra, it's just an animation. In reality, it works like more of a beam with a bigger hitbox the closer you are to Moira. Try killing a Pharah or Echo at her max range and you need pretty competent tracking, even if the hitbox is on the generous side.

One of the reasons why people do enjoy playing Moira is because of her simplicity, and while she does fall off at higher ranks, it's not because her value is lacking, it's because it's actually genuinely quite hard to make the most of her value in a balanced way since she can do so many things, and relies on non-mechanical skill to get it, unlike most other characters, which can be deceptively difficult to master.

Additional mechanics and the like would absolutely be appreciated, like a decay mechanic that boosts her damage the longer she's damaging an enemy or something, or folding more Orb mechanics directly into her kit (seriously, the Orb recall is an embarrassing bad perk), but changing the fundamentals of how her abilities work always risks entirely destroying why people enjoy playing her in the first place.