Quote Originally Posted by Shurrikhan View Post
I communicate. That said, "Please AoE when fighting 3+ mobs, and focus the same mob as everyone else when attacking the remainder," tends to me met with the same silence or offhand crude comment as "Tank, the healer has been able to keep you alive thus far off a single Regen and a couple oGCDs, and our damage is plentiful. We should be safe to do full pulls. Do you mind if we try them?"

Yes, I have multiple macros for each. They see use in about every fourth run. They have an effect in about every thirtieth. At some point, you wonder if it's even worth the space on your fly-out bar.
If you really do communicate, then there is no problem, you did all you could and that's fine. But it's important to note that this approach is completely different than just taking conclusions by yourself, thinking you know more than the others and trying to do their job for them. That is arrogance (having or revealing an exaggerated sense of one's own importance or abilities).