My spouse is type 1 diabetic and I got her set up on Loop a few years ago.
It’s out of this world how much work she had to go through beforehand. Several times per day she had to babysit her shitty pancreas or she will literally die. Read a number from one device, apply some rough mental math, and insert a different number into a different device. I’m honestly confused it wasn’t automated sooner.
I really respect this strategy but I could never get past one personal obstacle: what do you do if you want to click a link, say from an email? Do you switch browsers and copy paste the link? Or do you delve into the link in Edge? What if you eventually reach a website you wish you were logged into on Edge, but are already in Firefox?