I'd be okay with laning against Jayce if his e were changed to be less toxic to deal with for melees
You want to try to trade with
when he gets a ranged q and goes in with q+w? "Nah, i think i'll use my e which deals % MAX HEALTH MAGIC DAMAGE THAT SCALES WITH 100% BONUS AD!!! HEHE XD YOU CAN'T DO A THING, GET OUTPLAYED NERD"
Seriously tho, either change the scaling so it's appropriate for what it does (idk make it deal flat damage that scales with ap), reduce the knockback range/mini stun duration of enemy at end of channel, or just rework it into something that complements his melee all-in style (empowered aa?). If he all-ins, then he's obligated to commit to the all-in, not some non-interactive bullshit. Right now, he puts most top laners on suicide watch because he doesn't allow them to counterattack meaningfully after he brings them to usually half hp with 1 full rotation. He could stand to have some power trimmed.