If you want an actual dumb car that’s reliable, I don’t think anything beats a TJ series Jeep wrangler. Not good gas mileage, but the I6 engine in them is fantastic and it’s still relatively easy to get parts for them despite being 20 years old. You can add an after market head unit for CarPlay out android auto.

If you really do go new, you can disable the cellular radio. It’ll cost you a lot of convenience features, and you won’t get updates. But no cell radio, no ability for it to give your data to the mothership.

I have and use a resimed that does the phone home option. Once my doctor got what he needed I put it in airplane mode.

Distributor used the stats while I was reporting to call me and tell me I need new filters or other parts. I lol’d and bought them online for way cheaper. They stopped trying even before the doctor got all the data he needed.

Also, AFAICT it’s only data out, so I’m not worried about some exploit being delivered to the machine.

Final thought: I work in med tech. We have better security than credit agencies because we get fined more if we screw up. Personal data leaks are so common no one even cares anymore, but leaking someone’s medical info will shut a company down. You are likely safe, but ultimately never as safe as a “dumb” machine would be except they just don’t exist anymore.

Actual final thought: you will be amazed at how much better you feel every morning after actually sleeping instead of the dirty pseudo sleep you’re currently getting.