Muti-inputs corrupt the signal to a degree and this is more noticeable with Class D
I’m not a fan of multi input devices period for purist listening, they’re noisy.
Sorry, but nothing you said gives a technical reason for you to say:
"with multi inputs, a solid state Class-D is more susceptible signal corruption than a solid state linear amp is"
If you still believe this please show some distortion graphs proofs of both situations to explain to what seems to me to be a furphy.
Cheers George