[JThiessen]

Its not just the trim. Steering response rate, throttle response rate, etc. Yes, most of us will likely be rediculusly close between settings, but there are differences.
Like my on my Revo, I set the steering up with a really low initial response rate to help me keep from oversteering at 45-50 mph. Whereas if it were set up for the track, I'd be more aggressive with that and a little less so on the throttle (to keep traction).