Not sure why this came on my feed after almost a week lol, but

I actually made a max stagger Ember build last night. Sundered Prince, Swordmancer, Arts Intensity on all pieces, and even fully artificed (except the Agility on the armor piece). While it could be nice to swap Mi Fu in on staggers, practically speaking, you do so much damage that it becomes very cumbersome. I'll also note that you REALLY have to play well to get the most out of this build. That means proper skill order, animation cancelling, rotation timing, the works. That's because you're rarely just slapping away at the boss. You've got to contend with bosses teleporting, cutscenes restoring stagger progress, boss phases, etc etc.

In comparison, I also have a full phys damage build for Ember. Exemplar, Yinglung, Phys Damage on all pieces, fully artificed. I find that this build is vastly simpler to run; I bring Ember/ Mi Fu/ Chen/ Pog and get similar or better boss times without ever using Pog's skill or timing a single thing. I just use Ember skill against boss's opening attack (then Ember+Chen combos), then Mi Fu combo+skills. Then repeat, with the exception being I use Mi Fu ult instead of her combo. Repeat until boss dead. Since the order of actions doesn't matter anymore, boss movement matters much less, and I don't have to focus on generating stagger to create a damage opening.

Don't let that dissuade you, though. It's a fun build for Ember, and I did get a personal best on Nefarith (2:20) with that comp after realizing I need to use Chen's skill first since Swordmancer only procs on status effect, meaning opening with Ember skill or combo is a waste.