Lastly, Samsung says that Bixby will be better at understanding user commands by being able to handle incomplete commands and executing a task based on the available information. (9to5google.com)
Another possible reason on why the Amazon Echo could not hear or understand user commands is due to interference, which may be caused by walls and other objects. (techtimes.com)
The driver is able to input user commands by using the Lexus Remote Touch Interface — a mouse - like input device that seemingly floats above the centre console. (driving.ca)