So what is my enmity level when the mob turns from the tank and starts attacking me when I am not shooting anything at the time?

How about dying and running to rejoin the party from the Aetheryte. I heal myself up after weakness wears off. Mob starts coming towards me because I was healing. Yet for some reason it loses interest and goes back to original tanking party. All the while the tank had lost track of the mob because it left and went around the corner out of view.

Now you tell me what the enmity of that mob was as it was doing some pretty weird enmity decision making :P Granted that is the enmity under the current system, which they said was overly complicated.

Point is nobody knows how enmity truly works in FFXIV. It's all pure speculation based on their play experiences. And when every player experience has the potential of being unique. It's impossible to formulate a correct answer out of speculation!

This is just as bad as Facing north in XI to get better synthesis results. The darn game has been out for 8+ years and nobody still has a straight answer on if direction your facing actually affects synthesis results.

And even with the gauge, it is very vauge and only tells you what "YOUR" enmity is to the creature. Not anybody elses. So it can't tell you who pulled the enmity off of you. So it's not all that revealing on how the mob is behaving. Just a rough guide.

I would prefer numbers vs. colored icons. But SE seems to pride itself on keeping things a secret and having the player figure it out.

I just hope it doesn't show up when you are solowing. Because it truly is useless in that scenario!