Inkscpae still uses it requires ps2pdf from Ghostscript, to open ps or eps. This converts it to PDF, then poppler converts the pdf to svg. You won't see this if p2spdf is missing, (included in Ghostscript.)
I think you are right in that it is not needed writing ps or eps files. Saving eps uses some cario component. It is probably not the culprit here, but some strange loop of saving and opening again in Inkscape could cause grief if ghostscript were missing. Still can't say much with out SEEING the files.