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It messes up any indexing to write into the files. Insert also is more risky (might damage file) and slower than append. Thus create a separate file. The eBook is actually a Zip archive, so adding to it all is a more major and dangerous operation than creating separate files, which is safer, faster and no less functionality.
While it's theoretically possible to edit an ebook on an ereader, copyright and DRMed ones shouldn't be edited at all, and it's a much slower riskier thing than editing on desktop, where backups are easy. The Flash on an ereader isn't at all like NVMe SSDs.
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