Having a heal for her allies isn't against her personality.
It kind of is.
Fiora's an arrogant jerk that's extremely sure of herself and her skills, with the skills to back up being that arrogant.
Strikes me as more the main character of an Anime that's super-set on fighting people in a 1v1 with flashy sword techniques.
Also the general mindset of a player playing as an assassin. Gonna carry my team with damages, I'm so skilled.
Personality for a healer is more or less the complete opposite. Care about others more than yourself, don't want to hog the spotlight. Pretty soft-spoken.
I mean - a jerkface Priest or Paladin usually has awful supportive capabilities in a story, where a caring one usually has amazing healing/supportive capabilities.
Fiora has high ranks in jerkface and bitchyness.
It's having opponents who can't stop her when she snowballs, even 1v5 that's against her.
Again, an egomaniac that's crazy skilled to back it up and constantly singing her own praises - Blade Waltz strikes me as exactly the kind of skill Fiora would have.
It has a lot of flare, and it imposes the notion she is extremely competent and skilled in what she does. She's both showing off and being extreemly effective with Blade Waltz.
Look at Fiora's soundset:
Insolent peasants!
Run them through!
Prepare to die.
They dare not strike back.
To the death.
Do not hesitate.
Others try. I succeed.
Such unrefined style.
Submit! You have already lost.
I never hold back.
I long for a worthy opponent.
My favorite part of Fiora is her soundset. And if you listen to these? She's not holding back from killing her opponents, she's not holding back her skill so a fight is fair.
She's taunting her opponents and showing off with how much better she is than them, running them through with speed, elegance, and grace.
Which Blade Waltz encompasses amazingly well. It has a bit of that
playful taunting and arrogance with
's deadly blademaster skills.
She's not Goku where she lacks a bad bone in her body or some anime hero that puts on an eye-patch or weights to handicap themselves.
She'll kill her opponents because they annoy her, and is always at the top of her game.
As a Fiora player - it really hurts Blade Waltz was removed.
That was Fiora's signature move, and the most rewarding thing to use in-game about her.
It defined her play-style, and many have said she's a walking ult that's completely useless when her ult is on CD.
Which felt true in some games, so having such a defining, core skill removed?
Justified being irritated with or salty over.
Especially when
has always allowed to be Fizz where his Playful/Trickster skill has been largely untouched, being the center of his respective gameplay.
It's at least as powerful due to a significantly lower CD allowing more frequent use and wider applications, and Fizz has been allowed to see plenty of pro-play.