This is another example of "machines should think, people should work.". The computer is the boss. That may be the future.
The voice had 4 speeds, and all the experienced pickers would have it turned up to the top speed.
Once you were experienced enough though, you would learn the confirm codes for the different bays, and speak though the pick to the voice system 5 steps ahead just so it didn't slow down your pick.
Workers that came from a paper sheet pick list in the previous factory prefered the paper as they could memorize the pick sheet with a single reading, and thus pick faster - and if they did want to double check at the end they had the sheet in front of them to do so.
We'll be to machines what horses are to their riders. I'm not sure horses hate their riders.
1. https://en.wikipedia.org/wiki/Personal_navigation_assistant