@Dave26 -- When I first heard that the DIY APs simply altered basal delivery, I was skeptical as to its potential. Now that I have a front row seat watching Loop do its thing, I am amazed at how quickly it senses a trend change and acts just as quickly. If a real trend does not ensue, the program gracefully changes its mind and reverses direction.
While we humans tend to think of an insulin dose change as one with a fairly long life (at least one hour) and inappropriate to change direction too quickly, the algorithm revisits all decisions every five minutes and without pride, will change its course.
Faster insulin with a shorter duration (like Afrezza!) would definitely help, as would shelf stable glucagon. Temp basal rates is not the tactic I would have chosen but I now appreciate the safety, wisdom, and unexpected efficacy.
While these early hybrid DIY AP systems will get better, they are already much better than I had hoped.