Distinct audio quality difference btw audio in cubase and exported audio

Yes, cause that is not the solution to what your point is.

No. That´s not what I am saying. Although They do have an effect on what you hear, not on the data contained within.
What I am saying is, that if mixed and exported correctly, a mix inside Cubase will Sound the same as it´s exported file listened through the same device(s). And that if there were irks introduced by Cubase, they would also be recognizable through what you call “High end devices”.