Would Duality working with combo effects be a bad idea?

[MagiusNecros]

I wish Duality let all weaponskills strike twice for 10 seconds. Basically a Ninja's very own self buff in lieu of Trick Attack. I'm a bit bummed it's just a glorified Life Surge without the heal. Optimal use of Duality would be for Aeo Edge since it would be our hardest hitting attack. Personally though if you know you won't be able to fit an Aeo in then you can spend Duality on a different attack or just wait until you have a good opportunity to use it with Aeo.

[Viridiana]

I wish Duality let all weaponskills strike twice for 10 seconds. Basically a Ninja's very own self buff in lieu of Trick Attack. I'm a bit bummed it's just a glorified Life Surge without the heal. Optimal use of Duality would be for Aeo Edge since it would be our hardest hitting attack. Personally though if you know you won't be able to fit an Aeo in then you can spend Duality on a different attack or just wait until you have a good opportunity to use it with Aeo.

That would be awesome, but would also be pretty overpowered. It would be about as powerful as Mutilate dot if Mutilate had 100% uptime. And it would be at least as powerful as TA and stack with TA (every other TA, anyway).

As for whether to hold it or not, I summarized the math here: http://forum.square-enix.com/ffxiv/t...=1#post3144531

The math itself is a page or so before that, iirc.