An eink laptop, everything else being equal for content edit/creation, is not going to be lighter or smaller than a decent compact & slim laptop (Mac, Windows, Linux or ChromeOS).
The question was really more about being to edit epub on an ereader. There are certainly ereaders where you can edit / write actual text (Kobo Sage, Elipsa, any Android based model. The reMarkable and Kindle Scribe have "issues".), but you'd have to copy the text to a real laptop or PC to further edit and create ebooks. Even the best Android tablets with a keyboard are worse than ChromeOS due available Apps and limitations of Android. The iOS has different issues and doesn't yet replace a Mac Book Air with MacOS. Even a small ChromeBook is pretty rubbish to make / edit epub from scratch compared to a small& slim laptop (Mac, Win or Linux).
I have real keyboards that work on both an eInk Android and a Lenovo tablet. I've tried an iPad with a keyboard. Even my old 2016 Lenovo E460 laptop is far far better and not that heavy compared to decent 2000 to 2008 laptops.
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