I dunno, I have a closed-loop insulin pump / CGM and it pisses me off that the algorithm on which my health and life depend is not available for me to look at, understand and evaluate. Likewise there are all sorts of artificial limits on getting even read-only access to my data, such as blood glucose. It feels wildly disempowering to me.

I imagine I would feel similarly about a pacemaker. How does it work? What algorithm does it use to determine what to do at any given moment? Does it have settings? Are they optimally chosen? Are there bugs? Security flaws?