Aggro Indicator Change?

[xalmat]

It's not an aggro indicator. It's never been an aggro indicator.

It's an "In Combat" indicator, to show when you are currently "in combat".

Big difference.

You can be aggroed by a mob and not be in-combat. Subsequently, you can be in-combat and not be on a mob's hate list. The latter is pretty difficult to pull off, but the former is very easy to do.