I think they should something to help players differentiate if the enemy ability being casted is an AoE or a Tank buster. Similar to how they recently made the cast bar pulse red if it's "Interruptable", maybe they can make it pulse a different color or have some kind of fire effect or more bold font to indicate tank buster? If you're a new player and playhing through ARR as a tank, you never come into contact with experiencing an actual casted tank buster (because ARR uses many instacast TBs), but then you get into HW and start experiencing them and have to learn off the cuff by memorizing which attacks are TBs. They can streamline this by cueing tanks to look out for TBs, cue healers by making them look out for party busters (moves that do extreme damage unless mitigated, or reduce hp to 1) etc.