To put it in perspective:

ACN classes produce lower threat than other classes.
Not only are they slow start DPS (takes time to put on low damage dots before using ruin, fester, etc.)
But our damage is split with a pet that has it's own entity table.

Even SCH rarely pulls agro.
That's why they don't need agro reduction skill like SoS for WHM because Fairy heals are separate agro tables.

When you take slow DPS + split agro table it's enough ACN classes should never pull agro.
It's why we can still dot stuff that's been "flashed" and not mess up the tank.

On top of this I'm VIT spec.

Though I've occasionally pulled agro from new or inexperienced tanks.
I've never pulled agro off Titan.

Yesterday I did so without even using fester.