Short: If you can't use the skills solo, how are you going to learn in a group.

Personally, I play solo most of the time. Recently I started a playing a melee dps and I realized soloing is completely different skills then when in a group. If you are playing dps you need to know which moves are flank and which are from behind. If you mainly solo you're not getting that practice.

Some may say, just join a group and learn. I'm sure people trying to complete a dungeon wouldn't like it if dps are completely green on how to use their class in a group; We're learning So unless you have friends willing to play hours on end to help you make the abilities become like reflexes; your doomed to suck at first when grouping.

I'm sure this isn't the first game to do this to players but I've never seen it so bad before. I'm sure they'll not even give this a consideration but, hey, may explain why so many ppl in the duty finder are so green.