The glucose monitoring alone will be super useful.

There's been some Chinese wearables that have toured glucose monitoring - and to be fair, in anecdotal testing circumstances they've been somewhat precise (not precise enough to replace blood testing completely, but good enough as an early warning system for pre-diabetic people to do a blood test) - but they're still not up to par for the stringent requirements for a medical device in most modern countries.

As for the anecdotal evidence. My mum has been using such a cheap smartwatch that touts a glucose monitor, and she kept testing its results alongside an approved blood test monitor (she's not diabetic but has a thyroid condition that messes with her blood sugar, so monitoring is required), and the watch has always been within 3-4% of the blood test. Which obviously isn't good enough for medical certification... but for pre-monitoring, lance-free quick checks, it helps.