Just to clarify, Chaos doesn't have access to any sniper units. At all. We have no effective way of removing characters or snipers. That is why it hurts so much, as all we can do it either transports or put the characters on bikes/discs/etc so they loose the Infantry keyword.
Yeah, couldn't remember any, that's why I figured you'd need to ally it in. Bringing friends with strengths you don't have is a time honored Chaos tactic that started with the words 'Traitor Guard'
There's not even an Ally Matrix to worry about anymore in 8th, additional detachments can now deliver truly weird things.
Ask not the Eldar a question, for they will give you three answers; all of which are true and horrifying to know.