In respect to the excellent posting above.
I do agree, in general that the 'ask for the right thing, in the right way and it works' argument is valid.
However, if you stop and think for a moment, long term, we will end up with these, so called "simple devices" being vastly harder to use than any other device.
Other devices, be they Washing machines, Radio's, Cars, Phones, pretty much anything have visual clues of the function we want.
We may only need a visual reminder sometimes, or to read just the 1st couple of words and recall what we need.
But to end up with literally thousands of commands you must, recall perfectly, without any visual clue, it going to be impossible for many, without some AI feedback being added into these systems to help us out.
Open the door = don't understand
Please open the door = don't understand
unlock the door = don't understand
open THIS door = don't understand
Please open THIS door = don't understand
Open my back door = don't understand
Unlock my back door = don't understand.
Unlock and open my back door = Ok. Door is now open.
Such a scenario, whilst seeming silly, is NOT the world we want to find ourselves in.
Esp is you have say 1000 such commands in years to time to memorise
Ideally you would say something, perhaps a little wrong, and the "device" will ask you back, to check what you mean.
We could end up where some just think, you know what, it's easier to just use the key, or press the switch than to remember all this.