I just tried to play with automated workers, the result was really really bad.
The AI hasn't sent any worker to build a quarry to get that precious marble for 30 turns.... but decided to storm another city close by with 6 workers to build 5 farms and 1 mine.
[picture with the red circles]
And sometimes, if you build a worker in a completely unimproved city to have it improved, they just speed away to spam a decently improved citiy with three times more improvements than it can work
[picture with the blue arrows]
The AI hasn't sent any worker to build a quarry to get that precious marble for 30 turns.... but decided to storm another city close by with 6 workers to build 5 farms and 1 mine.
[picture with the red circles]
And sometimes, if you build a worker in a completely unimproved city to have it improved, they just speed away to spam a decently improved citiy with three times more improvements than it can work
[picture with the blue arrows]