Everyone is pretty much at the mercy of what goes into the panel, but somehow all the hundreds of miles between it and the "source" doesn't seem to be all that important.In the big picture,it's what is done after the panel that really matters and is the only place where you do have the ability to try to capture all it's potential.Or do more harm.You choose.
If you put a strangle hold on it or allow that power to be polluted or corrupted even more,you degrade what quality power you are getting from the paneland rob your system of it's true potential.
We are all wallpluggers,it's just that some of us have found that it's what you plug into the wall can make or break your system.
A 15 amp(if that) line with daisey chained multiple receptacles and powering numerous non audio products,isn't getting the most from the gear you've spent your audio dollars on.
But if you have never tried it any other way, how could you possibly know any of the stuff some of us are speaking about?