Again that wasn't what I was talking about, think of it like how FFXIV works where you can move out of the way of abilities so they lose their line of sight and miss only in FFXI it didn't work. But people still did it anyways, this was early after NA release. We called it manual dodge, and it was somewhat of a joke on those who we saw doing it.
Your suggestion doesn't add strategy to the game really because if you watch videos of games with "action" combat like Tera you can see that they spend a great deal of their time dodging, and aiming attacks, but it is really not that strategic. Perhaps it could be, but practically it just isn't. The reason that traditional MMORPG mechanics are much more strategic is because all of that basic stuff is abstracted allowing players to focus on more advanced techniques.
The more you try and "simulate" reality with combat in an RPG the simpler it becomes because real combat takes a lifetime to master to the extent that our characters in-game supposedly have. So when developers put these mechanics in they have to design encounters that are less demanding in other areas. Personally, I would rather spend an "epic battle" managing more complex aspects of combat strategy than constantly running circles around a mob while trying to keep my reticule centered. You and everyone else praising Tera's combat system as revolutionary and "next-gen" other than missing the point that the game is already flopping in Korea should realize this has been tried before and the results weren't as spectacular as you seem to hope. It's great if you like "flashy" effects, but it just lacks substance in the way that even XI's limited combat system was able to provide in abundance.