Thanks for your note. My issue with the opf file is that it takes effort to keep it in sync with the embedded metadata. So, it creates complexity.
For example, I convert from epub2 to epub3. The embedded metadata shows the format version to be 3.0 (as it is now an epiub3), but the opf file still says 2.0. I don't even know how to update it as even running "polish" to embed the metadata does not seem to effect the opf file.
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