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A/F can help "find" the power spots, as a general rule, at WOT, 12.8 is a good starting point. Measuring it can also ensure that the tune is safe, and ensure, for instance, you are not running to lean in a particular area. What these guys are saying is the way to go, use it as a guide or an additional data point, but not tune exclusively from that.
Also, if you are getting a tune done, they should go after everywhere in the throttle range and not just WOT, so they will need to be looking at much more than just AFR anyway.
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