Really?? Sorry I don't see what you are talking about. I've got it set to pretty high at the moment I don't see the LED backlight array. Neither do I see any issues with panning shots.
I usually use the thx cinema setting in the tv but I've put it on dynamic and cranked everything up to max and nope not seeing it unless you can tell me how you saw this.
Also having read majority of reviews before actually shelling close to £2k for this tv, I didn't anything regarding the backlight led array being seen or panning backgrounds etc.
Perhaps they have fixed it with a recent update, I don't know but I haven't seen any of these issues. Mind you my eyesight isn't that great but compared to the other tv panels I saw in store, the Panasonic one was the best one bar the LG OLED ones.