Back in the days (80s) they were joking about the programming languages used in early (star trek) holodecks.
> (1st attempt) "Computer! coffee please"
> (computer dumps coffee on Kirk) "argh!"
> (2nd attempt) "Computer! coffee in a mug please"
> (3rd attempt) "Computer! hot coffee in a mug please"
....
> (25th attempt) "Computer! 10cl of coffee at 50C with 3cl of fresh milk at 6C in a bottoms down ceramic mug of 15cl"
This means that you whould only be able to choose between several (discrete) choices instead of assigning the computer random tasks. But when the number of such choices is really small (eg. make coffee), then a simple physical button to initiate the task is better in almost every way.
