Don't get me wrong, I understand it happens - back when I did wedding photography, one of my massive pet peeves were the uncles and grandparents who stepped into the aisle with their massive tablets just as bride is starting her walk... But I do not understand it at all :-/.
I'd absolutely happily completely kill the rear facing tablet camera. I've had at least a dozen android and ipad tablets and I genuinely don't think I took a single photo with them - it'd feel weird and awkward and so ostentious.
(As always as a consumer, clearly I'm in minority here :-})