, SteveRichter wrote

Where is the driverless forklift?

The driverless forklift very much does exist and has in some places for years.  (I know a guy who works on them,)  Fully automated picking is used in some places to great effect.  Amazon certainly could build such a system if they decided to do it.  The fact that they still use humans says that they have found that to be more efficient/cost effective.  For something on that scale, I imagine that it would be more efficient to let humans handle it.  Otherwise you would have to have a smart conveyor system that would make UPS look like grade school.