There is no reason why IoT devices, such as fridges, TVs, beds,.... need to be exposed to the general internet. There are various techniques by which devices can just have the connections they need, and nothing more. You're assuming that everyone wants their toys to be on the general internet, when all they want is themselves alone to have control on it from anywhere. That can be done using VLANs, and all these IoT toys can be in secure enclaves that have no internet access
I'm willing to bet that the people who buy these "smart" devices also are geeky enough to have home labs and special setups to manage them. If they're not that geeky, they probably don't buy these fridges w/ screens in the first place