Leaving the fact of loving or hating the aggro icon aside, I can't help but feel the screen is too clogged with icons when fighting an enemy swarm like you do in some leves.

I was thinking how big a blow this deals to game immersion and thought it'd be better for the aggro icon to only show when targetting a mob, similar to how in XI you needed to /check the enemy to know how strong it was.

I don't think any of us need to be aware of whether or not every single mob in the screen is aggresive or not all the time, so just knowing when your target it placed on it should work nicely for both kind of players, those who hate it and those who don't!