I think this is very well said.
However, I guess I totally fall into the category of people that don't generally run with the alliance groups, unless I've already got enough people in the party to carry any amount of dead weight thru the quest.
Sometimes you get a decent player, and sometimes you get a person who has no idea at all what to do, and has no interest in listening to directions.
You can get that exact kind of randomness with an lfm, without bothering to go thru a dedicated chat channel.