I guess that with text communication, it would be too easy, right? The gameplay will change within the next days... like more levels in a row with the same team and stuff like that.
What if the text communication became available after ~1 minute? It would take some of the frustration away if you could instruct someone after a while (or call him names).
some people thought you had to add to the grey area to make a shape, but most people pretty good at it!