For the plant identification, I would say that these detection methods are heavily biased towards the data in the training sets. Sure, it’s probably good at commonly occurring plant symptoms, but would be unable to assess rare symptoms with any real accuracy. Same goes for diseases with similar symptoms.
I think it if fine for entertainment or research purposes, but should not be used for real world issues. AI should not be used to accuse people of crime they didn’t commit and have that be taken as evidence. Like how Google scans all personal photos and has falsely reported people of heinous crimes. Sure they catch some bad actors, but I doubt they are doing better than if they were to randomly report people’s accounts. And there is never a human in the loop to correct for false positives.