The paranoia over every device having internet connectivity and an outside accessible IP address is a little overblown. First of all, the networking hardware adds cost to production and design and if there is one thing companies love more than anything, it is cutting costs. Unless you specifically buy into a smart-home type system, the sort of connectivity that people are predicting will happen with IPv6 simply won't happen without specifically opting in. And if a product is smart and network enabled, I have no doubt it will be advertised prominently on the box.
That said, even if a product does come with hidden network connectivity, it'll either be piggybacking on your local network or include its own cell modem (and since using your network is far cheaper in terms of hardware and data costs for the company... worrying about a hidden cell modem doesn't seem likely). Anything on your local network is something that's very easy to control. IPv6 won't be taking away security, but it will bring greater opportunities to bring more and more devices online.
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