I can't comment on the camera stuff, but this temperature thing isn't a big deal. Now that I have a 2019 explorer with Sync 3 stock, I know what others were talking about.
In a stock Sync 3 vehicle, like the 2019 Explorer, when you turn the temperature knob you will see the temperature in the top left or right corners (drivers and passenger sides respectively) increment or decrement depending on which way your turning the knob. In addition, there is an overlay in the middle of the screen, almost identical to the volume overlay when you turn the volume knob up and down, except that its blue instead of red that shows the temperature values you're adjusting.
In my retrofit Sync 3 vehicle, when I turn the temperature knobs, the values in the top left or right of the screen adjust fine, I just dont get the big overlay pop up in the middle of the screen.
And if I hadn't seen it in a 2019 vehicle, I would never have known I was missing anything.
Hope that helps.