This is one of the main reasons for her decline. AA heroes generally were limited in their ability to pump out ability damage due to mana constraints. However, they made up for it in long sustained fights and good single target damage. You used to be able to draft her in heavy AA teams and get good results.
Good Vallas used to use abilities with the most efficiency and would win against players that just spammed stuff freely, and didn’t have the burst when it counted.
Now, mana tension is just so much less with savings baked into talents and kits, and people spam abilities haphazardly without much skill or forethought. Making blinds cleansable was also a considerable nerf. The power creep in AOE has also made her comparatively weak. The more damage that is flying everywhere, the harder it is to stabilize the right heroes with her brew.
I wouldn’t say that her healing is random, you know exactly what your brew will do depending on who is the lowest and your positioning. And comparing her damage to a Raynor, who can not heal is just a hilariously bad that I really question why you even went there. The fact that she can do both is kind of cool.
I personally would like to see cleanses not affect blinds again. All her wind talents are also underperforming which suggests she could probably get a baseline buff for her E (and her talents that give her more skill expression). I’d also love to see if she could have some functionality so that she can have like a skill shot blind to hit the backline ranged targets, kinda like how Ana used to have her long range grenade.