Don't understand why anyone would not like this, especially since you can go daily, there's no global loot pool which should have made people happy (e.g. its not like walk of echoes) and you're basically free to do it when you want.

To the "oh noes its freeforall nothx" people: You afraid of crowds or something? I can guarantee you it's not going to be that bad. Everyone's in abyssea.

There is no way for them to "instance" dynamis. Even the areas people call "instanced" are not really instanced- they have a limited capacity and you can be blocked from entering if just a few groups are inside those areas. The "instancing" is achieved through the areas having several copies of the terrain stacked outside of shouting distance of eachother. It's not like in WoW where everyone is in their own little world in a dungeon. So, considering instancing is not possible (good luck cramming more than one Beaucadine or Xarcabard terrain map within the game engine's world space), making it an open area is really the next best option.