I honestly would not have expected that. Maybe it was just not viable to work in joints that wouldn't be too obviously a departure from the 'turn into a copy of the original toy' idea they seemed to want to go with? But then, Megatron had the extra cannon on top of the turret...
I do wonder, if the Thunder Machine rumor winds up as true, if Zartan will be a UV color changer. All his recent color-change figures, what few there have been, have been temperature triggered.
Edit: and while I'm dreaming, maybe make him NOT bald, as I always thought Zartan had a full head of hair, watching the old show, and so it's always come as a shock on some level when he's bald to me...