We have not conceived useful applications that actually require AR yet. It has to be something requiring immediate feedback - maybe driving a car or piloting a similar vehicle would be such application. Maybe stock market. Or something entirely unforseen, like data analysis or warehousing - using human intelligence better?

Voice is much too slow, as is listening - might as well use the current devices at those speeds.

Computers started with bookkeeping and mass production control. It took quite some time for them to penetrate office market or to (partially) replace the previously used communication tools.

You're thinking very small-picture here. Contacts can be improved upon somewhat if we have the technology to make them into full AR screens.

Are you being sarcastic? I've been wearing contacts and glasses for nearly 40 years. Contacts are absolutely an absolute pleasure compared to glasses. I only wear glasses when I absolutely have to (i.e., right after I take out my contacts until I have to go to sleep at night and vice versa in the morning). For instance, I hate working out in glasses. They get all foggy and start slipping down my face from the sweat. Doing high intensity sprints in glasses is the worst.

Yes, this is correct.