Sometimes having a numeric value for a thing creates a sense of precision that isn’t necessarily reflected in reality. For all the tweaking, how often do you actually “stick the landing” bolus-wise with no adjustments after the fact? And when it doesn’t come out right, was that the fault of your I:C settings, or was it because you didn’t get the portion size right or didn’t know the cook added a big dollop of corn syrup to the glaze or whatever? Of course you have to have SOME basis for doing this, and I’ve done all the testing for basal rates, I:C ratios, correction factors, adjusted for times of day. But at some level of refinement these adjustments just kinda get lost in the error bars. After decades doing this my actual practice comes down more to experience, experience, experience, intuition, and CGM than on my Bolus Wizard, which I usually only resort to if I’m confronted with something truly unusual (“All right, I’m gonna have some of that pecan pie dammit!”). The whole promise of AID pumping is that your static settings are never going to be perfect and what you really need is a system that can adjust in real time to what’s actually happening. My own experience is that AID isn’t really there yet. But as CGMs have become more accurate the Wizard settings have become less crucial in terms of how I actually manage on a practical, day-to-day basis.