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I use docbook for my ebook workflow, so I have a good deal of insight into this question.
Employment-wise, I haven't seen a lot of demand for docbook, though occasionally it is called for in open-source documentation. A lot of programmers know about it, and tech pubs know about it. I'm guessing that DITA is somewhat more popular in tech writing circles. ...
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I was able to work around the issue as follows:
$ pandoc -S -o mybook.markdown mybook.tex
$ pandoc -S -o mybook.epub --epub-cover-image=images/my_cover.png title.txt mybook.markdown
By converting the LaTeX file to markdown, the second pandoc command was able to apply the Title, Author and Date information in title.txt to the epub file.
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Short answer: no. Having to learn something complex like this will simply delay actual writing. Try a very simple editor. An office product, or text editor such as VSCode which is quite nice. I suggest writing using Markdown, and then generate epub and pdf using Pandoc. Those tools take a day or two to figure out. The Markdown Extra syntax is nice, supports ...
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Unless I am mistaken I hacked a fix for this at some point by (1) unzipping the epub and (2) running a sed one-liner that edited the html to embed the image in an adhoc <svg> tag so it automatically resized to the size of the screen and (3) zipped back the epub. Doesn't matter any more in any case because shortly afterwards I opened a ticket with ...
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