These are the parts of Irelia that need nerfs not her W
Ionian Fervor: Irelia's basic attacks deal 4 − 17 (based on level) (+ 4% bonus AD) Ability power bonus magic damage per stack, up to 16 − 68 (based on level) (+ 16% bonus AD). At maximum stacks, Irelia gains 30% / 40% / 50% Attack speed icon bonus attack speed
Active: Irelia Dash dashes through the target enemy, dealing Attack damage physical damage, applying on-hit effects and healing herself.
These numbers are insanely overpowered and she wins almost every lane and mid/late game 1 v 1 because of it, while also being one of the best team fighting solo laners
Riot you need to understand Irelia shouldn't be beating Juggernauts and Skirmishers that have poor teamfights like Fiora in lane if you want her to have the incredible teamfight potent that she does.