Hey guys, this is nothing new. We have multiple quests in the game that require you hail the same guy or kill the same mob. For example, if I were to complete Trakanon access and then decide to do my Mythical, I don't automatically get updates for the epic kills, I'd have to do them again. At the request of 78% of the player-base we decided to give you credit for tracked AA kills, but at the start of this whole thing, we weren't even going to do that. Yes, this isn't a foolproof system, but its what you guys asked for. We even took a vote on it.
As with anything else in the game if this system has no value to you, you don't have to do it. This is a game and its supposed to be fun. We're trying to give you more fun things to do. If going back and revisiting some of those encounters isn't fun for you, we don't expect you to do it.