If anything, it's indulging in his skill-set. Having two guys great at face-offs at C and W creates a crazy double-threat on face-offs I've never seen before. Can put out Couturier for D zone draws and if he gets thrown it Giroux comes in. Put out Giroux for offensive zone draws and if he gets thrown out Couturier comes in.
Furthermore, he's free of the extra responsibility that comes with being a center such as having extra D responsibility. This setup also allows him to play with our best two-way forward and arguably the second best forward on the team (depends on your valuation for two-way skill-sets, gets tricky at that point). His goal-scoring is no joke so whether he's playing the role of a finisher or playmaker or setup man it doesn't make a ton of difference.