There is no sense to separate power with power amplifier. The power is the core of power amplifier, what we need do is to put it as near as possible to make strong signal amplifier.
VAC makes one but adding a chassis, connection cord, etc., becomes expensive, two chassis, shipping boxes, etc. It is not necessary IMO as a manufacturer.
This is an educated guess. Most amps, at the highest level are monoblocks. Most of the highest level preamps are two box (power supply separated from the amplification). So preamps are amplifying very low level signals and the important part is keeping the high energy power supply away from the low voltage amplification. In amps, the amplification is high power, so keeping the two channels separate is more important. This is so universal… it must be really obvious to designers: monoblocks for amps and power supply separation for preamps.
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