With runaans, she doesn't even need her Q, she just hops around the battlefield, spraying people with her E proc, unable to be caught by any kind of melee champion. Should we gut her attack speed? No. She was fine when she didn't build runaaans, she had strengths and weaknesses. With runaans, she has no weakness. and it completely changes her identity as a burst marksman with some dps and kiting potential, into a kite version of Singed.
Have you ever played kayle? she has plenty of weaknesses, the issue is simply that both her strengths and weaknesses are malleable. runaan's adds one strength (team shred and igher total DPS from more attacks), but at a different weakness. what do you give up for it? an ap item? less bust, they have more chances to kill you, or escape, or wait for backup. a defensive item? now you die faster. She scales so hard with items, and her kit is so malleable, that you can pick any 6 items except
and find a way to play it.
to pre-empt the incoming hurr durr easymode champ no weaknesses crowd:
-low sustain. Yeah, yeah, heal on the W. it's mana cost is pretty high and if you can force her to use it just for healing, she'll get bullied out fast.
-slow mover. Again, yeah W, but if she's burning mana to dodge all your skill shots and not turning that mana burnt into an advantage, you're likely winning. also means questionable roaming.
-No hard CC. there are several champs to whom the only real counter is hard CC. she can, at most, usually buy herself some extra time in a losing fight.
-can only help one target. foce her to make a choice in teamfights: who do I save? an early kayle pick is code for don't take assassins, take AOE. anivia, ziggs, annie, ori, etc all do pretty well.
-Poor burst. Yes, you can build rabadons, lichbane, and zhonyas to get some, but that's a ton of investment. when her nerfs came through, they ht the upfront damage the hardest. you have time to react.
Absent a rework, kayle will always be a late game powerhouse, but so will jax, trundle, azir, nautilus, vayne, xerath, sion..........