The technology of these faucets was seen often in a public washroom. Especially today, when a new cause for bacterial or viral contagions run rampant, it is best to reduce the amount of surfaces we touch.  We all know "Don't touch your face", but we all do. We might rub our eyes, scratch our chin, sneeze, and cough.   One way or another we are allowing something to get in. 

If you wash your hands and try to reduce chances of a health issue, does the physical touch of the faucet lever act as an path to re-contaminate your hands?  If you do not have to touch a faucet directly, or touch it with your finger tips, can you actually reduce the spread of germs?   Yes, that is why Surgeons wash their hands without touching a faucet surface.    

One way to reduce the spread of viral and bacterial transmissions is to frequently wash your hands, don't touch your face, and don't expose yourself and others to chances of transmissions. 

Consider an airport. You will touch bags, chairs, magazines, money, and various surfaces that thousands of people have been in contact before. (Maybe even just their sneeze spray.. ew) 

At this airport you need to use the restroom. You go off search (Hey, its better to use the bathroom in the terminal than the on the plane, right?) You find the restroom. Do you touch a door? Do you touch anything? Do you touch a faucet? Toilet tissue? 

So, now you are grossed out.    Good. Wash your hands. 

But if you touch a faucet to wash you then have to touch it to turn it off.. Did that just negate all the efforts to reduce germ contact? 

Many places now have sensor and touch free faucets. Touch free hand driers, soap dispenser, toilets, and doors,

What about home?  What if you just came home from a day out? You come home, wash your hands - nice and clean - now turn off the faucet.... Did you get the germs back? Were those disgusting microbes of filth in waiting on the faucet handle, hoping they can hitch a ride back to you? Who knows, really? Not to mention you might have car keys, door knobs, and packages that are far more likely to carry a filthy microscopic hitchhiker. Washing your hands, you hope, will rid you of that issue.