They dubb the birds because they where used for cock fighting, dubbing was used to keep the rooster from getting his comb, earlobes, or wattles ripped off to keep from infection. Know we dubb to show because that is what people like, it looks more clean.
I do dubb sometime (but its everyones...
Any game bird has to be dubbed. OEGB, standard OEG, Modern game bantam and standard moderns.
If you dont want to dubb there are lots of other options to show.