So why is this a thing?

Unmutable alarms. I can see having it as an option, say your child has a sensor and you of being woke up in the middle of the night to give it a jelly bean. But im a 50+ year old adult that would rather sleep at 60 mg/dl (as it will be that most of the night if i did my job right, been doing it since earlier 20's). Which with default settings you'll be waking up to your phone screaming at you, if it doesnt go up, you'll be up again in 10 minutes.

So what asshole at the freestyle libre programming devision programmed around the default sound setting because I'm too stupid to monitor my blood sugar levels correctly? What was the thought? "We'll annoy them into having perfect blood sugar!" On a device that you state i should not be using to make bloodsugar corrections. So why you waking me up at 3am (for some reason thats always the time my sugar is leveling below the 'line')

Fix your shit, since by the sound of it you'll be out of a job in under 10 years.