That observation is only useful if you can point at a capability that humans have that we haven't automated.

Hunter-Gatherers were replaced by the technology of Agriculture. Humans still are needed to provide the power to plow the earth and reap the crops.

Human power was replaced by work animals pulling plows, but you only humans can make decisions about when to harvest.

Jump forward a good long time,

Computers can run algorithms to indicate when best to harvest. Humans are still uniquely flexible and creative in their ability to deal with unanticipated issues.

AI is intended to make "flexible and creative" no longer a bastion of human uniquness. What's left? The only obvious one I can think of is accountability: as long as computers aren't seen as people, you need someone to be responsible for the fully automated farm.