1. The command set is broad enough or user input is complex enough to make other UIs inefficient.
2. The voice UI is up to the task of correctly interpreting the voice input correctly most of the time
What "most of the time" means for the second item is somewhat personal and use-case specific.
For item 1, examples where voice is better right now, or could be with reasonable NLU improvements:
"Text my wife that I'll be there in five minutes."
"Get me driving directions to the nearest Indian restaurant with at least 3 stars on Yelp."
"Order six rolls of paper towels and a bottle of Windex from Walmart, delivered to my home address, for delivery by Saturday"
"Remind me tomorrow morning to review this web page"
"Create a shopping list with the items from this recipe"
"Create a basic presentation with one slide each for each entry in the table of contents for this book"
Voice can be better. As others have pointed out, as long as it's like playing Zork where half the time the response is "you can't do that" or "I don't understand", voice interfaces will continue to flounder.
1. The command set is broad enough or user input is complex enough to make other UIs inefficient. 2. The voice UI is up to the task of correctly interpreting the voice input correctly most of the time
What "most of the time" means for the second item is somewhat personal and use-case specific.
For item 1, examples where voice is better right now, or could be with reasonable NLU improvements:
"Text my wife that I'll be there in five minutes."
"Get me driving directions to the nearest Indian restaurant with at least 3 stars on Yelp."
"Order six rolls of paper towels and a bottle of Windex from Walmart, delivered to my home address, for delivery by Saturday"
"Remind me tomorrow morning to review this web page"
"Create a shopping list with the items from this recipe"
"Create a basic presentation with one slide each for each entry in the table of contents for this book"
Voice can be better. As others have pointed out, as long as it's like playing Zork where half the time the response is "you can't do that" or "I don't understand", voice interfaces will continue to flounder.