"There is no reason to believe this time is different." I don't understand the reasoning here. Human physical work had become obsolete, so, new jobs appeared

"There is no reason to believe this time is different." I don't understand the reasoning here. Human physical work had become obsolete, so, new jobs appeared in intellectual domains. Now, machines are going to be more efficient than humans in intellectual work, what are those new wonderful jobs that human can do but machines can't do cheaper? We could argue that the last wave made obsolete the horse, not the humans, it's just that the new horses are so powerful that one human can control innumerable horses. This is the first time that we are the obsolete worker. That's what makes this time different.