I agree. I got by for 5.1, but it’s difficult at best trying to manipulate that many separate tracks.
And if all the other programs do it? including the other mastering programs? (i’m not sure how Pyramix, Sequoia, and Sadie do it, but I assume they take multi channel files on a track? Im not certain.)
But I also think good arguments for this specific function were made back in 2011: