Human senses may be fairly consistent day to day, but variability across humans is quite significant. Even a single person's faculties (vision, cognition, focus

Human senses may be fairly consistent day to day, but variability across humans is quite significant. Even a single person's faculties (vision, cognition, focus) change drastically over longer periods of time, or when they're tired, sick, or worse (drunk). Machines at least have standardized hardware with self-test protocols and onboard diagnostics. There are innumerable scenarios in which machines have no good solution yet, but I suspect over time the heuristics will reach a threshold of "good enough for public use."