It's just that much better than 10. Just that extra push. (or words to that effect)
I could see an advantage in decadal range overlap. Whenever you cross a decade boundary, an 11 or 12 position position switch would not require having to stop and fiddle with a number of other knobs. ie., take care of the carries or borrows.
The guitar reference reminded me of the knobs in the attached image. I don't think they are useable here, but they probably work well for the viewing angle on a guitar. I think they are a top hat style with index or dial and then cast into an overall cylindrical shape.