Post-tune: it could probably be slightly useful, I don't really know. If anything, the changes would be minor and would probably be more for drivability then performance.
As for road tuning in general, we could debate it all day long. The problem I personally have with road tuning is the lack of repeatability. It has its advantages, but you really can't tune WOT in 4th or 5th gears on the road because that is way too fast for the street. 3rd gear at WOT (for me at least) is ~80 mph, I can't imagine pegging it in 4th or 5th on a public street.
So, there are some certain advantages (obviously more real world) but the disadvantages mean I don't really like it. The lack of repatable logging is what bothers me the most. Plus, I don't want myself or a tuner or whomever taking my car over twice the speed limit, no matter how desolate the road might be.
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