This is exactly why I stay away from software controlled appliances as much a possible. Any OS upgrade can break the app. If the manufacturer does not upgrade the app, I'm hosed. (And not upgrading my phone is simply not an option for a long list of reasons.)
Think it through: once a manufacturer has sold me a device, what motivation is there for the manufacturer to keep supporting software for a model that they have already sold, especially if that model is no longer current? Maintaining software is expensive.
Do you have a fridge with a built-in web browser? If so, good luck browsing the web with it. (Try browsing with a browser from ten years ago and see how well that works.) Even if you are lucky, and you can still browse some sites, chances are that your fridge will try to attack your internal network in short order, because older browsers are choc-a-bloc full of security holes.
The internet of things is mostly a bad idea. It's just that people haven't woken up to that yet.