Of course, nowhere in this discussion is the general thoughts about the speaker impedance, and that this is a tiny integrated amplifier that might just be mismatched to the speakers, or that this is otherwise an entirely new device vs. the original.
We’ve simply thrown out all Class D because one very small integrated amp didn’t cut it. Never mind that in all classes of amps, different amps have different output impedance curves so amp X may perform well with a pair of amps but amp y may not.
Before you throw out an entire class of amplifier altogether you need better control of the testing, and to use multiple examples of Class D.
Otherwise, if it was me, I’d say all Class A was crap because I heard one brand of Class A amps and it hurt my ears.