Why does Anivia sit at the top of the winrate ladder since her MYMU rework but noone cares?

She's like this for two years. The only real change she recieved was her wall having it's vision removed, other stuff are only bugfixes and adjusts that went with the overall game and included all the champions (like Runes reforged fe. or items). She's been sitting at the top since forever (the worst for her being this patch where she sits on 22nd winrate and 50% - which seems pretty reasonable at least). She's a squishy late game midlane AP champion that has been doing GREAT in a meta of extreme early game, tankiness, mid having low impact and magic damage being inferior to physical. How is that even possible?

Two things:

#Her waveclear and safety. If you ever fought Anivia, you know how unfun that shit is. Your only option is to push her pre-6 so she loses as much minions as possible because before she gets her R her waveclear is horrendous. Only that you can't do that. The moment you cross the River border, enemy jungler is in your back and if you survive, you need to recall - which gives Anivia CS advantage. If you don't, well I guess that's obvious. If you try to engage on her, yes, her base HP is low so you proc her passive, but that is actually useless for you, because you can't kill her anyway (creeps would kill you sooner than you would kill her) and it's not like you could use it and zone her really then because her AA range is 600 and she just AAs you out of the lane instead and Qs into your face if you engage and oneshots you. Then she hits 6 and you are stuck in a game where you need to AFK push the wave and cannot roam, because otherwise she takes your turret for nothing and you'll get behind if your roam is not 100% effective (that means you need to kill the whole enemy botlane and even then you get less gold than her in that time). And on top of that she outscales 90% of the midlaners too.

#Illusion of counterplay. You look at Anivia's kit and say: "Well this champion is conditioned and has skillshots, that seems pretty fair to fight!" Wrong. What happens is that she walls right into you (with deceptively long range - 1000 btw), which acts like an instant AoE knockback and stun that also completely redirects your following movement commands and that just makes you completely disoriented (and cannot be spellshielded). Then she places her R under you which you can't leave because of the wall before it gets fully charged. Her R slows you until you leave it and since you can't do that, try dodging her following Q. And you are dead. The only thing you can do against all this is a mobility spell to jump over the wall and run (since you can't burst her down). Try that playing an immobile champion.

All this causes Anivia to be absolutely unfun to play against and when she knows what she's doing, she removes your agency over the lane completely.

My propositions:

#Make her interact more, her kit screams otherwise

Make her wall not instant so the opponent can actually react to that and prepare for his character to move in completely different way that told to. Like Ornn's Q.

Lower her mana costs so she's actually ALLOWED to interact and not just sit on her CD until you are forced to engage to find out it's worthless because it doesn't do anything.

Lower her R's damage to creeps so she can't just decide where the creep wave stands by pressing one button.

Refund her E's CD partially (and maybe some mana) for killing a creep with it to compensate and balance her pre and post-6 waveclear.

Lower her AA range (by 25 at least) so she actually pays for her scaling and can't just pussystay in the back and farm easily anyway when her egg is down, but increase her base HP so she's not afraid of trading and creates less 'counterpick wins' scenarios (= lower range loses, higher range wins).