Disclaimer - I know nothing about this technology so I'm not certain this is helpful.
After reading this thread and as I happen to know someone who works at Medtronic HQ I made contact asking if there were any plans to revise the Guardian 4. He does not work in the diabetes device division. I was provided with a little info and directed to this press release:
With CE Mark approval, the benefits of the MiniMed™ 780G system are now available with a new sensor that takes less than 10 seconds to insert1 DUBLIN, Jan. 8, 2024 /PRNewswire/ -- Medtronic plc...
news.medtronic.com
Reading between the lines Medtronic know they made a lemon with the G4 and are not inclined to revise it, but instead put their money into re-designed their sensors from the ground up. The new sensor is half the size and is supposed to be easier to attach. It's now been approved in Europe but not yet in the US to the best of my knowledge. Likely to be available worldwide by summer, assuming FDA approval goes smoothly.
Again, I know nothing about these devices so I'm not sure this is useful information.