A combination of factors.
- I didn't have many sources for examples of epub3 documents at the time.
- Epub3 has more complex ToC tags, for example, epub3 can put images in ToC. I'm not sure what theducks' example above is, some quick research appears to show epub3 ToC have to be <ol> <li> tags.
- Lack of examples where epub3 is substantively better than the equivalent epub2.
- And my lack of motivation to support both epub2 and epub3 natively.
To quote myself from several years ago:
Quote:
Originally Posted by JimmXinu
The funny thing about EpubSplit is I made it primarily to fulfill my sense of symmetry after making EpubMerge. I very rarely use it myself. Calibre's Edit Book feature didn't exist at the time I created EpubSplit. If it had, I doubt I would have made EpubSplit.
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