Nope. Some of us have never used a power meter.

When I got my fitting the fit bike had a powermeter built in.. Once I was in a position that was correct on paper we adjusted for comfort. The whole time we watched my power level and it dropped some as I got too low since my hip mobility wasn't as good as it should have been. The powermeter seemed to help.. I'm guessing a good fitter would have been able to diagnose that without it