Why don't higher end amplifiers come with a separate power chassis?

There are some amp manufacturers who do think aftermarket power cords make a difference in sound quality.

I do not doubt that for a moment. One thing is certain, confirmational bias is powerful. If someone is convince something will not make a difference, it certainly will not. This mindset can be extraordinarily rigid and unreceptive. Debate will be pointless.

Charles

and know this if you listen to mostly music pro is the way to go. Kudos

If this is your listening experience outcome, good for you and stick with it. I find well designed and implemented audio products for domestic environments provide a higher level of sound quality. So to each their own.

Charles

In addition to the examples cited above, Border Patrol Audio uses separate chassis for signal path and power supply. Thomas Mayer (Germany) employs this approach with some of his amplifier models. I can see a strong case to be made for either this method and the more common/traditional mono block design.

Charles