I dread replacing anything that breaks in the next few years.
Genuinely asking because I plan to do this once I have to get new appliances, is there something missing that way?
If I want to monitor my fridge's temperature, I can buy a widget that does that for a dozen or so dollars and have that sensor talk to the home automation system of my choice. And when the fridge dies or otherwise gets replaced, I can move the sensor to the new fridge. (And when a new sensor comes out that I like better, I can spend another McDonald's Value Meal worth of money to use that instead.)
Besides: We here on HN should all have a certain amount of distrust for devices that self-report problems.
This distrust is part of the reason why ZFS doesn't trust hard drives to self-report issues and does its own checksums instead.
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But that's a general rant. To answer your question more-directly, if somewhat-tangentially: One of the popular open-source-oriented YouTube dudes (Jeff Geerling?) recently bought a dishwasher that had functional modes that could not be accessed without a wifi connection to The Clown.
And that's... that's not good: In order to be able to use the functions that the thing natively includes, one must always allow it to call home to mother.
Also the device is generally designed with internet in mind, so certain local-only functions don’t work properly without internet.