In the world of cleanliness, the less surfaces that you hands touch, the less likely you will have to contend with harmful bacteria. If you are someone that gets pretty dirty from either baking in the kitchen or working on your car in the garage, pressing the handle down will just get the handle dirty, and this can be a problem especially when working with things such as raw chicken. Automatic options are great because you simply wave your hands underneath the nozzle, and it will give you just the right amount to wash away all of those germs and dirt right down the drain.