I do rather frequently, too. Its just that not everyone is okay with that, and also typing is the core gameplay element as well for many things, such as "unstick me", passwords for some areas, locking/editing furniture, searching for friends, etc. Also it would be pretty chaotic in graal city if there was voice chat. I mean if it was privatized voice chats that would get rid of the chaotic clutter but would also inhibit players to only talk to people privately, or be forced to use the clumsy xbox typing format.