With this thread i would like to appeal to ZoS to re-create the Undaunted coffers on the way that they offer only one shoulder piece, so not 50:50 chance of getting the wanted one.
I.e. Grothdarr and Tremorscale coffers separated.
I am open to possibility that from that specific coffer reserved for just one shoulder piece players continue to have only 33.3% of chance to get the wanted armor one, but that's the most far i would like it to go in the matter of luck, because so small chances to get the wanted piece nowadays really leads many players who aren't that lucky to the state of frustration and possibly giving up from getting wanted sets.
I am aware of the fact that ZoS has even made that to be less dependent of the luck in the past making it 50:50 only, but still some players need more than the month and more than 20 tries to get their wanted shoulder pieces from these coffers while playing Dungeons - that they don't like to play because they are pvper's who don't like pve! - dedicated and in blind hope every day.
And if somebody - there are such people too even if it is more rare - likes to test their luck, why not to create some specific game content or event or whatever in which they could have the chance to test it till the Judgement day!

Level of the luck cannot be influenced by the human, so it makes this thing unfair.
P.S, Same as the open world sets random drops, and the other stuff like that that highly depends only about luck...
There's no Higher... not outside the man.