I think that is just another limitation of the SW that they will have to account for.
As for fuz's not archiving; I may be wrong on this but I think there are problems with almost everything not archiving correctly so it's not just those.
I just clicked to Archive and upload to steam, and all that is pre-selected is the scripts. The sound files (fuz) are not selected at all or the esp's. Hope I can just select the voice folder & do it manually . I would subscribe to my own mod, but I heard that can cause issues too.
Your supposed to be prompted to add files by hand - but I cannot see this prompt.

EDIT
Craaaaaash! - these incidences can wreck plugins. Crashed when I tried to add my correctly sized jpeg