While I agree with you on e-ink being a much better reading experience, I would not say a Kindle is for technical references or other books with exact formatting requirements because the screen is so small. This, along with being underpowered, also makes reading PDF a pain because they are tiny on the screen and the Kindle has a hard time rendering them.

Now a Remarkable or other larger e-ink device would probably be better than the iPad, but last I checked they cost the same or more than an iPad Pro that can do so much more they feel like a waste of money.