"Please go back and read my comment again." - I did and it did not become clearer to me what you wanted to say (assuming that I have misunderstood you).
"But even if I had said that, it is certainly true that no major commercial raw conversion application does demosaicing the way you suggest" - do you have a source code of all of the commercial software to confirm it? Alternatively, does any commercial software does explicitly state what does used debayerisation algorithm represent itself?
"but it wouldn't be a very realistic representation of the scene now would it?" - yes it would besid…