This sounds like the cheap way out. You stopped ksing but you basically started monopoly. Long range classes will just tag 90% of the mob before your each them.
How is this fair? If a large group spawn long range will just tag each mob you try to reach unless they are close to you. I can literally just sit there and pick at all the mobs you are about to hit and “tag” them.
You know whats fair?
If you attack a mob you get the credit for the quest regardless of contribution. One of the main problem is questing as there isn’t enough mobs.
What does this solve?
- Questing
What are you talking about this doesn’t stop the bots if anything this would give them a good incentive to make a script for archers to tag the mobs, so the ALWAYS GET the loot.
Also your solution would completely make world boss a trigger finger game at this point. Which I can’t tell if this is worst. 100% chance you loose loot or a possibility to get loot, base on your dps.
This “Simple Solution” has been thought, used, and have been throw out the door.

Of course party buffs still apply to those in parties… same with rare drop boost.