Autoscan is fine for short distance situations as the autoscan reading will be accurate for both the router area and the wireless workstation. As the distance increases, the router area may be unrestricted but at a remote location, the workstation has a conflicting neighbor.
In my own situation, the router is on one side of my home and my workstations are at the extreme other end where my nextdoor neighbors have their router. My router does not see the conflict as it is so distant, but my InSSIDer shows my neighbor's router is the most powerful at my remote workstation. I had to ask him to "fix" his channel because of all the bother.