I recently highsided my bike, posted the incident over in Faceplant... My tires were well scrubbed in, but it wasn't until I got the bike home and under some good light that I noticed this:
Although I'm sure that there were many factors involved, it appears to me that I ventured a little to far over into the unscrubbed "chicken strip" area, and it is possible that if that area had been scrubbed in, I may have had a bit more forgiveness. Is this 100 percent accurate? Probably not, but if pre scrubbing in the tires would help even a bit, and doesn't appear to do any harm, and the manufacturers suggest it for whatever reason, I will resume doing it in the future. I had always done it to previous bikes, but bought this bike on the road in Colorado and rode it home to Arkansas.