Absolutely we should expect them to solve easy/valuable problems first. Maybe that's fancy organic vegetables in a greenhouse, which certainly sounds much easie

Absolutely we should expect them to solve easy/valuable problems first. Maybe that's fancy organic vegetables in a greenhouse, which certainly sounds much easier than 5-foot weeds growing in a thousand acres of deep mud! But we farmed for a long time before inventing weedkiller. First by recognising weeds & pulling them out. Later by plowing, which is really just substituting mechanical work (from oxen) for human labor (and smarts). I don't see a fundamental reason that robot-weeding couldn't ultimately replace most chemicals & most plowing, but obviously not next year.