The chaotic play style is for the same reason drivers don't pass in the passing lane. Those controllers not waiting for mobs to gather close together are not thinking of what they can do WITH you. They are only thinking of what they can do. I never grasped the lack of not-so-abstract thought. When on a team I see what others are doing as extra powers of which I may take advantage. A tanker joins my controller; I'm thinking "hey.. now I can herd! What powers of mine will be more effective on tighter mobs?" Of course I'm not the one doing the herding. What the tanker is doing feels like a passive power for which I just have to wait to take effect. Thinking so I have much more fun with assault riffle blasters' full auto. Oh my.. herd 'em up, Beef Boy.. I'll wait.
The point is: people don't think beyond themselves. That seems the nature of common thought. It's not a fast lane. It's a passing lane. PASS! Remaining silent won't help. Speak. Say wait. If the controller gets mad THEN avoid the player in the future. If the player doesn't get mad something had been realized and a team player has been born to go forth and think of how to accent powers in combination with others.
