I don’t think it’s unrelated. The title of this post is “prescription required,” not “subscription required.” Whether or not the device should be so regulated as to require a prescription is one question. But if the FDA has determined that it’s required (and thus you must get a prescription from your doctor), then why should you be able to use it after your prescription has expired? If your doctor prescribes you 1000mg of opiates, you don’t get more opiates when you run out of them unless you renew your prescription with your doctor.

The problem in this case seems to be that the device requires a prescription in the first place. But since it does, I don’t see an issue with enforcing it.