@turnbowm- I believe it cleans up the power as the current goes from the wall (or a power conditioner, power strip, etc.) to the component, so the longer the cable, the more it conditions the current. This was explained to me by a company that specializes in cables. They aren’t trying to sell longer ones as they also said to get the shortest interconnect possible.
Some consider a power conditioner a tweak, but I would say it is an essential component, and can be had for a relatively low investment, although you can spend thousands on them if you want. I don’t think that is necessary for typical home audio environments. Exceptionally high current ones could necessitate an expensive one.