She's supposed to be able to shred everyone EQUALLY well as long as she duels well.
Flat would favor squishies over tanks, which defeats the point.
I think that's not really correct. If both targets just stand there, flat would favour her vs squshys, yes, but squishys are usually squishy because they have 1-3 of the following qualitys: High mobillity, Range and high damage.
It is usually alot harder to get the vital procs cs squishys than it is vs hulking tanks, and squishys usually return more damage, so more pay off from hiting vitals vs squishys would actually help her havein equal dueling power vs all opponents.
Right now, her issues hitting vitals on squishy targets gets compensated with raw physical damage on q+aa+e, which is basically the same low counterplay pattern she had befor the rework.
I'd prefer her haveing flat truedamage on her vitals and less raw damage on q+aa+e so she actually needs to play the vital games vs squishys aswell and therefor gets rewarded more then doing it cxorrectly.
This probably reduces her overall power and allows for some compensation buffs, like reverting the slow nefs on E, increasing her base health or slightly buffing her Q dash range or giving a small ad ratio on the heal vs vitals.
This would meand she would still win duels bs tanks, but by outsustaining them rather than simply deleting them on the spot, while haveing a more conditional burst vs squishy compensated by more survivabillity and utillity.
But as it is right now, tanks lack the tools to avoid vital procs and are just helpless vs her at some point, while squishys get deleted by point n click burst if she's ahead.
If not, she just fails to be relevant at all.