Type 1 diabetic here - for what it's worth, CGMs aren't particularly invasive. At least in comparison to the many many years of finger pricking! But a smart watch solution would be cool. (I actually do get my CGM readings on my smart watch, which is really nice!)
I know Apple has also worked on this stuff in the past, but from what I remember the accuracy wasn't good enough to be safe for diabetics. I'd be really curious to see accuracy stats on this in comparison to Dexcom and Freestyle CGMs.
I would definitely be excited to use something like this, but for me, the biggest quality of life improvements for me will be continued improvements with closed loop CGM + insulin pump systems.
Indeed though, advancements in (affordable) closed loop tech matter more than where the CGM is worn.