I agree. This seems to be more of a cloud calculation rather than a hardware feature. The only reliable sensor they could add would be a barometer, as it is usually the only thing that is reliable outside and in (temp, humidity, wind, rain, etc need to be outside sensors…) and I do not see how a barometer can make weather that hyperlocal.
I would not mind paying extra to receive this service… good way for Rachio to raise funds while still being eco friendly (why get rid of a perfectly working Gen1 or Gen2 for a cloud calculation). They can offer it as an upgrade in the Apple or Google App stores.