I would just like to add that if it is SE's intent to include 1-shot boss mechanics then the execution (i.e., timing) mechanics must be *perfect* (i.e., there can be zero tolerance for server or program side errors - not even ONCE). This just makes common sense - you want the players to be fully capable of dodging it (i.e., they are 100% responsible). Given this aoe lag, at least a good portion of players cannot. Hence, SE cannot include 1-shot boss mechanics until they get this sorted. Sorry SE, you can't have your cake and eat it too.

The way I see it, there's only two solutions: (i) remove the 1-shot mechanic (e.g., make it less damaging so that people won't be 1-shotted), or (ii) solve the networking side of it to remove this aoe lag problem. I suspect it might be SE's indecisiveness to take either solution that is resulting in this lack of effort to correct for this as perceived by its subscribers. Solution (i) is perhaps feared by SE that it will make the game regarded by many hardcore MMO players as already easy to become lol-easier and potentially lose their subscription, while (ii) entails a complete overhaul of their programming, which might entail more human hours and downtime and QC checking.

Either way, this indecisiveness to bite the bullet is the worse solution than adopting either (i) or (ii). SE is potentially crippling its own endgame content - not only easy but with the aoe lag issue - unrewarding. Doesn't matter if the endgame content will be available on DF or not - aoe lag still unsolved. It will also cripple future endgame content (limits the kind of dodge mechanics in future boss fights). Planning those for Leviathan? I suggest you can it and sort out this aoe lag first.