For me it's all about aesthetics. I don't know how Jack Sparrow is but most of the DX figures I own have blatantly obvious seams on the back of their heads. '89 Batman, while having the best PERS eyes on a figure has this garish panel on the back of his head. It's the ONLY critique I have against an other wise perfect figure. There's really no reason why it couldn't have been done like the DX 02 which probably has the best hidden access.
https://www.youtube.com/watch?v=GNmRHXnV-ao
Have you seen the upcoming DX 10 T-800? You can practically see inside the head, it's awful. Nicholson and Ledger, while not as bad aren't anything to write home about either.
Who cares if you can't see the back of the head while it's on display? A display is only part of the experience. Have you guys ever just, I don't know, admired a figure? Take it out and look at it? There's more to it than it's shelf life. That's like saying you'd only care if the clothes were tailored and cut from the front and wasn't complete on the back, sort of like a hospital gown. So you wouldn't care if your Batman or Joker had their ***** exposed on the back?
Oh, but nobody can see the back, who cares?
If it has to have PERS then I'm sure there's got to be a better way to access the feature without some robotic like panel on the back of the head.
PERS was a nice gimmick, it was fun in the beginning, but that's all it is, a gimmick. I could do without it. It's no better than old action figures I used to have where a giant button was sticking out of the figure's back to make it punch or kick. Not only did it look bad and throw off the realism of a figure, if it broke the whole figure would be ruined, just like PERS.