[dotancohen]

A side benefit of the paper towel is that in-swinging doors can be pulled with the paper, not your hand. Imagine how many people _didn't_ wash their hands then pulled that door.

[_asummers]

Trivially fixable by a little foot hook on the bottom of the door intended to be used to open the door after you're done.

[Rhinobird]

What if you have no foot? Or the foot hook isn't there? Or you have to turn a knob?

[4ad]

Plus pipelining.