Same for anything else. I don't see the whole "oh you need firmware update to improve the product". 90% of the time it just works.
So what happens if the fridge isn't given internet access ? Or washing machine?
Dishwashers, refrigerators, even (and perhaps especially) cars.
"Just don't connect it to the Internet," is sadly less viable option as time goes on.
I feel compelled to quibble with your word choice here. Not connecting appliances to the Internet remains a viable option. It is simply one that is increasingly not common or not readily available.
"less viable option as time goes on" is pretty much "remains a viable option, increasingly not common"
?
To me, "less viable" implies there some outside factor or internal failure preventing it from working. But non-internet appliances will continue to work just fine, if you can get one. I.e. it's a viable choice, just one with less and less availability.
HP fixed a remote exploit a few years back. Theoretically someone could use your local wifi printer to install a persistent backdoor on your network. In practice HP uses updates to patch leaks in their cartridge protection (the most complicated tech in the printers). And accidentally sometimes bricks printers...