I just think you have a choice of one or neither of these, but not both: 1. Internet connected. 2. Code and forget. Choose one or none, but not both. Selling

I just think you have a choice of one or neither of these, but not both: 1. Internet connected. 2. Code and forget. Choose one or none, but not both. Selling medical equipment that gets hacked by wannacry is not acceptable. It isn't even theoretically possible to promise that the OS won't drop support for things since you may rely on something that is later exploitable. Realistically speaking, unless you're writing code for something crazy like VR, there is a great chance that with tests you can update the code to match the new OS in a week or two.