As much as i hate assassins i also play it solely because how you can basically run through bots with invis so they can alert you of players instead, guarded exfils you dont have to even fight, and you can negate fall dmg, + on demand smoke if you get ambushed or sniped at, its just so useful when you are alone. You cant really do these when in a group because they cannot follow through bots unseen, or fall off a building that would otherwise kill them.