Phantom breaking in period?

[thumb5]

...all these components take some time to settle in before polarity is at it's best.

I am genuinely mystified by that.  How could/would polarity change during this supposed settling-in period, and what constitutes "best" polarity?  I had always thought polarity was a binary-valued thing so the idea that it might change over time in some gradual way to approach a somehow better value makes no sense to me.  If you were talking about plugging in cables so that the connectors were swapped, then I could at least follow the argument, but unless I misunderstood that's not what you had in mind.