That's exactly the privacy endgame though: stuff a chip with cellular capability into everything you can and stream data to data brokers for double-dip profit whether the customer likes it (or even knows it) or not. The market for data about people seems to be almost infinite and bottomless.
This can only be fixed with legislation. I predict it will become a major battle in the future.
This is the opposite if what telcos want. They want to have a low latency connection to every device in the house. Imagine your toaster and your tv stream in real time to an ad server what your are doing. You put a piece of bread in the toaster, while you wait you walk to your TV, start using the remote and you have a peanut butter commercial on Hulu. And this link inside the consumers homes is handled by 3 US cellphone carriers, not much competition. Or maybe it is just me being paranoid.
I'm guessing the main reason it was a separate circuit board was so they could install a compatible cellular module depending on what country it was to be shipped to.