These changes are very welcome.
But I don't get how decisions are made within ArenaNet. The addon clearly targets new (unexperienced) players, because even though you can enter the addon only at level 80, you have to play a tutorial. So. Target group: New unexperienced players (aka. liquidity in business terms).
But yet, your very first sentence is "The Jade Sea meta was designed to be the ultimate open world finale, an epic conclusion to the 10-year Elder Dragon story arc.". This targets players that play Guild Wars 2 from day one. In my opinion, you have to decide which kind of player is targeted to complete the meta event. At the moment, the meta event is only doable with mainly the three meta classes. Any new player will not even know about these meta classes, but is expected to take part in a coordinated event with 49 other randoms. Seems kinda odd to me.