Sadly I don't believe ZoS realizes that ESO is an MMO so they continue to add a bunch of single player story content to the game.
While I want more group stuff....sadly I had to realize the main story, fighters guild, mages guild and some other skill lines progress on solo-only instances. While we are playing a MMO type by server the game intent is that of TES which is a single player RPG.
We prob should be glad there are trials and dungeons
-PC (PTS)/Xbox One: NewBlacksmurf
~<{[50]}>~ looks better than *501