What I’m saying is those medical device companies just need to upgrade hardware. Not the user.

That is a valid perspective, but it doesn’t take into account the burden on end users. Would you still feel that same way if you were the user, and the “update” required literal surgery on your body - not because the device failed, or expired, but simply because network standards have changed?

Because it’s the cellphone equivalent of creating a pirate radio station, to put it in terms better understood.

Why not use the analogy of a Wi-Fi repeater or extender that can handle multiple Wi-Fi standards simultaneously?

For that matter, it should be rather simple to limit it to only “listen” for connections from known medical devices (though it’s not like there are a bunch of 2G phones running around these days).

I’m listening, but so far, I haven’t seen anything that explains why this would actually be a bad idea, or how it could cause any harm.