My only issue with that is Flayed Shot in AoE would boil down to Kill Shot spam which, given the relatively low cooldown of Flayed Shot, would mean our entire rotation in M+ is just Kill Shots.
I have an idea in my head to have Flayed Shot be a pseudo Marked Shot from Legion. The way it would work is that you get 2 charges of Flayed Shot. Kill Shot would hit all targets with Flayed Shot and refresh the DoT effect.