I agree with the sentiment of your post entirely.
However with the issues present in the fireteam design (get relocated on your map for joining one), and the pretty well non-existant group communications I feel that Bungie still has a very long way to go to truly make this the game your claiming it will be.
I truly hope they get it fixed as I have greatly enjoyed the beta so far but these two issues leave me somewhat on the fence as to whether or not it will be worth buying.
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Fire teams are easier to join mid mission or beginning of a player in the missions start. But yes, they need in game shortcut communications. :o)