i think you might be slightly misunderstood as to roles in a moba type game such as this one. what you just described is a way to kill any hero in any game. what you just described is essentially team focus. that worked on pre nerf gali. that is what you need to do to say a miko/montana combo. a healer support should be destroyed 1v1 by many, MANY characters in this game. instead, it takes someone to be playing an assassin character and be considerably more skilled than the alani player.
if a player is playing as alani and he gets 1v1 by anything other than perhaps rath’s ult, then that player drastically outplayed the alani player. even losing to the rath is somewhat debatable, because the alani should have riptide into stun him a long time ago.