[2019] What's a champ that you would play but don't because of an awkward mechanic?

Warwick - q hold doesn't buffer when chasing an enemy. You basically stand in place if you aren't in range.

Sylas - I expect his w to behave like talon q, but for whatever reason it doesn't work the same (press q on enemy, walk up until in range, then q goes through).

Pantheon - The e cancellation gets buffered. If i get locked up in a stun, and I need to absolutely get my e off when the stun ends, I will spam press the button, but then my e will instantly cancel as well.