Well, I guess I just have a misunderstanding of your version of "portable" and "desktop" ~~~~
For me, when I am at home, I have something on the table with amp+dac+source that I never plan to move. The room is quiet and the headphone is open with large impedance~~~ The music I will be classic and jazz with very high recording qualities. When I am outside of my comfortable little room, I use my "portable" gear that is normally easy to bring out and does not have extra inter-connect cables on it. The phones will normally be CIEM or good close full size that has really good isolation. In this way, the ambient noise will not get in the way of my music. Since it is outside , and I do love music in general, I will fire up different types of music base on my mood (or to change my mood using the musics sometimes).
Hence, I think we are very different people and sorry to push my life style into yours. I guess I just gave some very bad advice here
P.S.
Base on your profile, I am not sure Y you called your desktop setup "quasi-portable". I think the Schiit DAC + the comming GS-X stands for a complete desktop setup for me. Or you actually have portable gears that can send out balance signal without double amplification?