The problem is the very reason you stated for having it: multiple facets of the game can be played at the same time. It doesn't matter if that means one character is healing or tanking or selling or tradeskilling - two unrelated things are happening at the same time.
Think back to when /ooc was global. People sold things from every zone and when you went to buy something you just ran to wherever they are and bought it (or they would port to a bank and then go back to xping). There was no specific role of a character as you could do it all.
Besides, if you have two clients open where one requires you to watch text for items you want to buy or sell and the other requires you to be focused on pulling/killing/healing... someone is going to think they can multitask when they can't. I don't want to be in a group with someone who isn't paying attention.
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