It's actually the opposite. Attack speed items scale from your base attack speed. So this actually nerfs many sources of attack speed bonuses on him. And the attack speed nerf actually moves him from just shy of the best base attack speed to the lowest base attack speed minus some like Caitlyn/Graves/Illaoi. Actually it seems like 1/3rd the champ list sits at 0.625 attack speed base. The extra bit after E just kinda puts it back to how it was for a split moment. This does nerf his harass/CS'ing and minion control in the form of pushing some, which I know would have certainly affected me playing Kennen if I was active, as I used to rune attack speed quints specifically (better than some crappy 15 ap).
It also affects the rate at which he can charge his W auto attack mark which is his most reliable marks for stun. Have W auto, and for maximum bologna, you either zone them from the lane entirely or press W spell right before it falls off, and by then you maybe have another W auto mark, which is the stun without having to land Q or E, which makes Q free to land, or just all in. Still, I don't think this fixes too much. Because AP Kennen does well in games with low durability champions (or meta), making his AOE more lethal than other times.
Maybe shorter stun mark duration might be necessary. It's 6 seconds now. And you can reset it with W press if you are going about for zoning and stun and don't just auto tap it.
[w auto] -> wait 5 second [W spell] -> (by second 10) either E into them or land Q or auto creeps for [2nd w auto] = stun + unload unused spells was my typical passive aggressive pattern. Minimizes counterplay yaay me
But actually the attack speed nerf really does hurt his ability to push reset and overall control the lane and trade a little bit. But it won't make his laning phase suddenly bad...
on the champ I wasn't gonna build it on, and the other one that nobody gets unless they take glacial augmentation
