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The "butt dyno" is always important. We don't ride or race on the dyno. We simply use it as the most practical tool available when doing R&D and/or tuning. From the highest level of racing, to simply dialing in a street bike, the data a rider provides is the final adjusting or completion point.
Just one example: On some past projects for American Honda/HRC - I've spent months and hundreds of dyno runs getting several exhaust systems and target A/F maps designed. On the dyno, the criteria was met. On the track, in some cases, the rider no likey... You would swear they must be on glue because "the dyno" said it was perfect. Their feedback may or may not match what the dyno is telling us (whether that be A/F or HP related). But at that level, it's simply all about lap times and providing the rider whatever makes them comfortable to go faster. It's the tuners responsibility to provide that (sometimes regardless of what the tuner thinks).
For a street rider, if there is a reasonable similarity in what they "feel", and data from a past/present set-up that are known to work, then that sounds like a good compromise. And so many times, jetting is all about compromise for the every changing elements of temp, humidity, elevation (and many other factors). Anyway, the point is that input from both tools (rider & dyno) are very important to making everyone happy.
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