Automation would increase productivity and replace workers in manual jobs, so we wouldn’t have to work as much.
Here we are in 2024 and we’re still working at least eight hours a day. We’re actually afraid of automation because it’ll take away our opportunity to work eight hours a day so we don’t starve.
Productivity has also increased exponentially (note: may not actually be exponential, just using the word as a figure of speech, but a math nerd can correct my use of scale here if they want), but has the average worker benefitted as much as they should have? Of course not 
Whats also hilariously discouraging about this is how old this trope is. Upon inventing the Cotton Gin machine Eli Whitney had hoped it would reduce the need for slaves and hasten the decline of the institution. It had the opposite effect. It only reduced the number of slaves required for sorting cotton. Slaves that previously would have been used for sorting were sent to the fields, a much more grueling and physically taxing labor. More slaves in the fields = the capacity for larger and larger plantations. So not only did it not hasten the end of slavery it also made the lives of a lot of slaves worse while super charging the industry and making the slave owner class even richer.