[Quoth]

Great for reading books. Maybe for reading loads of code with only occasional annotations.
eInk varies from poor (New) to dreadful (Older) for partial page updates, only whole page updates (i.e. ONLY reading and page turning). Most applications are like 2000+ years old in document handling, i.e. SCROLL entire document, not page based. Scrolling is terrible compared to paging.
The original Kindle DXG firmware converted web pages to a paged interface, no scroll. All eink based readers I've seen lately use scrolling for web pages. It's terrible.

No model is going to very good for programming / editing. Actual novel / fiction writing is more sequential, though no WP I know offers a paged GUI, even when showing page mode they scroll!

So you need viewing and editing software that's page based, not scroll based. I don't know of any.

Anyone would get an idea of how bad eink display is for ordinary wordprocessing or programming by using Wikipedia on most ereaders.

The application used will make FAR more difference than model of eink. The technology inherently only suits reading pages at a time, no scrolling.

I started programming with punched cards, then line editors, then full screen editing in 1979. I've also written a text editor. Sadly a 2002 top of the range matt finish 1600 x 1200 LCD was better for program or novel editing than most screens today on laptops less than $1500. The Retina type screen is pointless as the screen size usually means 200% scale and shape is the dumb 16:9.

I thought an eink screen would be nice for at least novel writing, maybe programming, but no suitable page only applications exist that I know of on Windows or Linux. Android is a joke for content creation, though I take notes on it. No assurance any particular application can print, use external storage or use network shares. A file manager even as good as Windows 3.1 seems to be an optional extra.

So I'll put up with my LCD laptop and use the 7" ereader for reading! I do paste stuff from web or technical sources or programs into LibreOffice Writer, clean up styles (ensure page breaks via heading style and anchors with TOC), Save as odt and docx, then convert to epub with Calibre. Then the Kobo seems best for reading annotations back into laptop via Calibre Kobo Utilities (Using Annotations plugin and the Kindle is MUCH slower and less satisfactory context).