I've had this discussion with Hummingbird, the drone firm I use for my osr. Their Holy Grail is pre symptomatic disease detection and targeted spraying. Unfortunately the camera technology is just not there yet to achieve this. It's easier for rusts but not latent septoria. Algorithms and risk prediction tools are just that, tools in the toolbox. You still need a human brain to interpret the results and make a decision at the moment.