I’m not much into dyno numbers.

pittsburghracer said

A dyno tune isn’t always a good track tune. Two different worlds.

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I agree the dyno tune isn't always the best track tune. But if you're starting with an unknown combination a good dyno setup and a capable operator can get things to a pretty good starting place. The alternative can be an educated guess or sometimes just a plain wild *** guess.
The power left on the table can be less and time it takes to get things dialed in at the track shorter when starting with a tune that has been sorted on the dyno first.
A safe dyno tune may keep you from hurting the motor while trying to get things in the ballpark at the race track. Especially with an unknown motor, unknown carburetor and an inexperienced tuner.
I think the value of a dyno has been proven over the years by the fact that teams racing at the highest levels of competition own and or use dynos.