I am going to keep stressing this...
I think case manufacturers were blind-sighted by the fact that there needs to be a conductive cover on the case that covers the action button to facilitate the needed finger gestures to operate that button.
None of these cases outside of what Apple, Beats, and perhaps one or two other companies mentioned here are currently implementing the needed conductive covering in their cases.
From Apple's MagSafe case product description (as well as Ottorbox and Beats):
"This case works seamlessly with Camera Control. It features a sapphire crystal, coupled to a conductive layer to communicate finger movements to the Camera Control."
I would bet most of the other case manufacturers being discussed in this thread DON'T have that feature. I only saw one manufacturer with this feature which you can find
IN THIS POST.