Serious question. What does Irelia actually lack?

She has burst damage, sustained damage, physical/magical/true damage, sustain on Q and conquerer when proc'ed, ranged hard CC that can stun multiple targets, a 90% slow, conditional hyper mobility, an uninterruptable 50% physical damage reduction channel, her passive is literally a fucking Wits End built in when fully stacked just without the healing aspect. She has a great early game, mid game, and late game. Snowballs extremely fucking hard. She has nearly the same level "Yasuo effect" of if you bury her early, you better end it because she'll eventually get farm and items. Waveclear "issues" are solved in usually her first purchase of Tiamat. Her Level 2 cheese is one of the deadliest in the game. You're her bitch praying to the gods you dodge her E while she's stacking her passive because if she does stun you, you're likely dead. Especially with Ignite. You literally have to play champions like Darius, Renekton, Pantheon, Kennen, and Jayce who can bully her off the wave so she can't stack her passive. Oh, but she outscales literally all of them.