Considering the usage of LLMs by many people as a sort of friend or psychologist we also get to look forward to a new form a control over people. These things earn peoples "trust" and there is no reason why it couldn't be used to sway peoples opinions. Not to mention the devious and subtle ways it can advertise to people.

Also, these productivity gains arent used to reduce working time for the same number of people, but instead to reduce the number of people needed to do the same amount of work. Working people get to see the productivity benefits via worsening material conditions.