So where is the counterplay to Champions that Shields themselves for just doing stuff?

You can't do anything against them because everything (note: EXTREME HYPERBOLE) they do generates a shield, nullifying any retribution. Both of them will constantly engage on you and if you engage back you get smacked with severe minion damage in return - it is a lose-lose situation.
Other than cheesing them with a ranged top (which due to their mobility is still a gamble) what else can you do?


rips them apart.

?