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Trained repair professionals at hospitals are regularly unable to fix medical devices because of manufacturer lockout codes or the inability to obtain repair parts. During the early days of the COVID-19 pandemic, broken ventilators sat unrepaired for weeks or months as manufacturers were overwhelmed with repair requests and independent repair professionals were locked out of them. At the time, I reported that independent repair techs had resorted to creating DIY dongles loaded with jailbroken Ukrainian firmware to fix ventilators without manufacturer permission. Medical device manufacturers also threatened iFixit because it posted ventilator repair manuals on its website. I have also written about people with sleep apnea who have hacked their CPAP machines to improve their basic functionality and to repair them.
PS: he got it repaired.
I’m glad you mentioned insulin pumps, because there is a community of developers working on pumps, making them available to a broader audience, providing more people with better control over their blood sugar levels than manufacturers are willing or able to provide on their own.
https://openaps.org/
What you are arguing for is a threat to systems like OpenAPS, and to the people who benefit from them.