Then it is a point without a distinction.
Sigil doesn't care, Sigil can't manipulate that database, and you will need some other software to do so -- which presumably specializes in metadata (and indeed calibre does) and can therefore offer a much better GUI editor for such.
The fact that Kobos have made a step forward from from ignoring series completely, would be a very relevant point... in the Kobo forum rather than the Sigil forum.
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