I'm insulin dependent with steroid induced DM2 and the accuracy, and reliability of both the app and Libre 2 sensor are quite appalling IMO.
I went through a period of 6 months where the sensors were either failing off or failing with different error codes for 2 out of every 3 applications. I am supposed to be moving to the 2 Plus but have so many libre 2 replacements to get though it will be a while off yet!.
Things have improved, but I recently went away without a spare (don't ever do this!). I had a hypo of 3.4, and in the confusion lightly tapped the sensor against a door frame (I'm visually impaired so this isn't unusual) then the sensor predictably failed with an 365 scan error code leaving me with the nightmare of being mid-hypo without any monitoring for the following 48 hours before I could get hold of a replacement!
The app is also wildly inaccurate, inconsistent and doesn't always support the most up-to-date versions of Android, alarms frequently fail and the software hasn't been updated for 9 months(!), I frequently experience hypos of 3.4-3.8 that don't even show up later on the daily graphs? This along with 34% lower results when compared to a traditional calibrated glucometer (when post-op in hospital) which even after a change of sensor were so concerning that nurses completely ignored my Libre results in favour of traditional finger prick testing.
I worked in medical supplies for nearly 30 years, Abbot were actually a supplier and I have contacted the NHS' MHRA about my experiences, given the huge cost of CGMs to the NHS their response was quite disappointing TBH.