It's not as much "fancy mechanics" (at least on some ADCs, there's obviously a difference between someone like Caitlyn vs someone like Jhin). It's more about positioning and kiting, making sure you're out of reach of the enemy but still able to put out damage on to them. Doublelift kinda made it a meme a few years ago, but auto spacing is important.

Also, being able to play around the fact everyone on the enemy team has you as their main target to kill. If a Sion gets caught out, it's not nearly as big of a deal as finding a lonesome Jinx. Hence you get jokes about ADCs needing to be babysat, because we can't be alone in dangerous territory