He probably doesn't have any DSD files, and already owns a preamp. That would make them things he need not consider. I know I didn't need, nor care, about having that functionality when looking at DACs. Different systems have different needs.
It was phrased such that those things are meaningless in a 2.0 speaker setup. While a headphone amp is, indeed, meaningless in a purely speaker-based setup, the other two things are not. Was addressing what was said, not speculation on other needs. Though I admit my own wording was not quite clear enough, as the two items are not important in every 2.0 speaker setup; I simply meant nothing about them makes them unimportant simply because one is dealing with a 2.0 speaker setup.