Why do some manufacturers reverse preamp polarity in the first place?


My Rogue RP-5 reverses polarity, so I switch the pos / neg at speaker terminals. The manual does not mention this, however, I wrote the company and they the amp does reverse the polarity. 

Now my question is...why? I would say 98% of buyers of this amp do not know to reverse the cable connections. I would say most reviewers did not as well. Yes, I realize, polarity reversal is not noticable in most instances. Especially, since many recordings are all over the place when it comes to polarity (at least that is what I've read).

So the question remains...why...why not just have the amp terminals set up so the buyer can just plug in as normal?
aberyclark

given so many reputed recordings are 'all over the place' regarding polarity/phase....

What then is the correct way to not adversely stress the power train when re ordering polarity?

mute the sound, then switch?

or just switch polarity on the fly as it won't matter for neither the speakers or amps will encounter undue strain or stress?

... just wondering
Much ado about polarity? Well....

Music by any polarity would sound as sweet? Nuh-uh. Scratch that.

A fool thinks polarity matters, but a wise man knows otherwise. Close, but...

There is no polarity either good or bad but thinking makes it so. That's it!
Most of the technical reasons don't hold water since it comes down to what the tap is labeled. A little dab of red will fix ya.  But a purist would still want control on a per-recording or per-track basis.
Soundstage is an artifact of the recording and reproduction process and is not correlated to the sound heard in the concert hall, IMHO.
Polarity absolutely matters. These are cheap components and these designers have no business making electronics.