There are some areas and game mechanics that hamper casual grouping. What I am talking about is when you decide to take a break from grinding and offer to help other folks out by grouping with them to handle a particularly nasty mob, teach a technique, or whatever floats your boat in being a Good Samaritan.
I know there are a lot of more important issues needing attention. I am just posting here to say again that some of the phasing mechanics in-game make casual grouping difficult and in some cases impossible.
On several occasions I had a fellow Tamrielite volunteer to help me out with a quest and then I try to help them afterwards to get them through a tough spot only to have game phasing block me from entering into the area with them.
Guilds and grouping with folks for a common quest, raid, or Craiglorn grind is one thing that works, but in a social based MMO I personally get a lot of satisfaction helping other folks out of the blue. A serendipitous assist from a complete stranger is, in my opinion, a basic foundation to establishing a sound gaming community.
This action is not completely impossible; it is just hampered a bit for the more excruciating areas where the mob is hard to kill.