Interesting read. My wife is T1D, moved to a closed loop last year. It has been life changing for her - this is not an understatement. Her mental health has massively improved because she isn't having up to 3-4 hypos a day. One thing not mentioned in the intro, hormones hugely affect T1D. She's started perimenopause and everything went out of the window. Closed loop has made this much more manageable.
Indeed, insulin sensitivity varies so based on amount of movement during day, stress, hormones, allergies, slight cold, etc that the rigid algorithmic approach they teach patients doesn't work in practice. I.e. you can follow what you're taught by diabetic nurse and you'll have bad control nonetheless. What's the model she uses? My guess would be tslim+Dexcom? It does reduce stress a lot.
The omnipod was a good change for her as there was one fewer places to fail (being airbubbles in the piping).
And now with the closed loop, it's stepped up again.
One thing she has found though - her hypo awareness has dropped. They 'feel different'.