SawTroll
Information Collector
Unless you consider the .08 to .13 of metal, times the number of drive links, in total weight savings on the spinning chain. Surely could be a factor in limbing and cookie cutting.
It is a tiny factor, but remember that the difference vs. .058 only is present in the drive tangs. The upper part of the drivers of .050 chain is .058 with Oregon and .063 with Stihl chain.
Today .050 with regular .325 and 3/8" sort is an artificial gauge, that is made only because it is "traditional" in some areas.
A lighter chain at least theoretically can spool up a little faster, but it also will carry less momentum in the cut. I don't think anyone will notice either factor.