Is There A Reason for Mono Amps for Ultra-low Noise Class D Modules?

Sure, people will always want mono amps. No matter what the driving technology of the circuit itself.    Theoretically best stereo separation,  individual power transformer and output transformers.  You're right though, why?  They take up little room and run cool.... people always want better.  So naturally if you have two of something, its better I guess.

I guess the advantage of stereo separation is only as good as the preamp in front of it though...