SmartDevices are inherently fragile due orders of magnitude more points of failure. Instead of "Smart" functionality being optional it (due commercial interest)

SmartDevices are inherently fragile due orders of magnitude more points of failure. Instead of "Smart" functionality being optional it (due commercial interest) becomes core control circuitry on which the functionality depends. An example(hypothethical) SmartFishtank which dispenses food to fish with pre-programmed schedules and monitors/adjust water temperature. Its connected to internet and can be monitored remotely. Users can even upload new feeding schedules. What happens if its hacked? Fish can be boiled, starved or overfed because SmartFishTank has control over the whole device. In another corner there is a electronic fish tank with mechanical feeder that is set to one of 3 feeding modes. The fish tank monitors temperature and acidity, but cannot adjust it and only send a audible alarm or a SMS message. However whatever happens to the electronic components, they cannot harm the fish inside because its purpose is to just receive data.