When fixing editing epubs, one of the most often uses of Sigil for me (apart from quick spelling mistake edits) is having the handy ability to split and merge, keeping track and updating all the file/link references without Sigil would be a nightmare.
When building my own epubs (personal use), I have the html source file and any images/css/fonts
Once I import a html file, and the resources linked in it, I usually run the 'Split at markers', then 'Generate ToC', Check the metadata, fix semantics, check the validity, then save the epub. Job done (usually).
If you do the same import in calibre, a lot of styling etc is flattened and you end up with loads of 'calibre###' styles - not as nice as the given style names if you then need to edit the epub at any point.
So even if in future Sigil is embedded in calibre I'd still want the existing Sigil (or it's abilities) so any simple html-epub conversions don't get calibre'd.
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