Update – shortly after I posted I checked the online dashboard and it said that Smart Watering will begin tomorrow. But my iPhone app didn’t reflect this change. So I killed the app and relaunched it — and then it also said that Smart Watering will begin tomorrow.
Before things changed, I did manually reduce zone 1 from 100% soil moisture to 41%. And now it is the only zone that shows that Smart watering is scheduled. So soil moisture setting seems to affect things (as it should), but if it is at 100% does it make sense that no Smart watering would be scheduled in my sandy loam for any future date?