Maybe because you're in an office and don't want everyone talking? Or maybe you're on the bus and don't want everyone overhearing what you're doing? Or, for that matter, think about if you had to say out loud everything you do on a computer. Heck, a three hour meeting makes me hoarse.
Sam Altman is a person to doesn't actually do anything that would be considered actual work by people who do actual work (like me), so of course he is going to find a natural language interface the best he's ever used, because it mimics what he does every day, which is to tell other people to go do actual work.
Also, he has a stake in promoting his products, so what everything comes out of his mouth is dead on arrival as far as meaningful content, relevance, and veracity.
Sam Altman is a person to doesn't actually do anything that would be considered actual work by people who do actual work (like me), so of course he is going to find a natural language interface the best he's ever used, because it mimics what he does every day, which is to tell other people to go do actual work.
Also, he has a stake in promoting his products, so what everything comes out of his mouth is dead on arrival as far as meaningful content, relevance, and veracity.