Sej, azir, lulu, and rek'sai are all due to pro play.
Shyvanna is just an auto attacker... Stat checks aren't good.
Syndra is a worse example of unhealthy than anyone in the lower group (miss all skill shots, press r to kill).
Also - Ahri gets complained about a lot because people who don't play her think Ahri players must be bad since she's a "sex symbol" and they just be "weebs" and not true "gamers". In reality, Ahri is probably one of the healthiest champion designs in league. While her numbers can end up too strong, she never needs to be guttered because of this.
I make this argument on EVERY Ahri hate thread I post on, and in 4 years have never seen a half decent argument against it. Ahri burns a long cooldown (flash or ult) BEFORE going for her all in. She can burn that cooldown, have her charm dodged, and be missing a big part of her kit for a long time window. That's HEALTHY. That has counterplay, that gives Windows of opportunity for her opponents as her only real mobility is on a long cooldown (her q ms isn't anywhere close to dashes), etc... It's much better than say, syndra fishing for w-e stuns, and not committing to anything (i.e. using her r cooldown) until she hits it. Fizz is likewise healthy from his ult perspective (although he gets a busted e to compensate - what does Ahri get?).
If you're getting hit by charm in Lane without her using flash or R, you're playing wrong. It's probably the second hardest cc to land in the game after anivia (who gets a wall and a slow to help land hers). Morgana gets a wonky hit box, lux gets to pass through one Minion, most other cc skillshots are faster.
in the trash bin citing unhealthy gameplay mechanics while the champs i list below are all consistently in the meta for the WORST reasons? hyper mobility, high base damages, high scaling damage, and strong early games to boot.
are usually complained about EVERY season, and when they finally get nerfed it's love-taps that get reverted 3 months later, while adding some bullshit buff on top of it?
in the game if they want to shred through a full defensive build on a champion with two tank steroids and neutered damage.