In my experience, in large space office type setup, where one "room"/ "hall" is significantly over a thousand sq feet, with multiple AC vents, fan is not really required.
In home type setups, where one room is 120-250 sq feet, ACs easily create cold spots and warm spots in a room, and a slow fan helps smooth that out. That is with ACs meant for home use, non-industrial ones, of course.