But I personally find reading on a Kindle (or other e-ink devices) to be a far, far better and more comfortable experience than on an LED device like an iPad - honestly, it's as good as reading from paper books (and I say that as a lifelong bookworm).
The battery life, form factor and weight are also firmly in the Kindle's favour when compared to an iPad.
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.
I've never even tried to read a technical book on a Kindle, largely for the reasons you outline, but also because I tend to read such books in a different way. With a novel, you're relaxing and reading large chunks at a time, whereas with a technical book I'm usually simultaneously taking notes, coding or looking up related stuff in a browser, so I use a laptop or desktop PC for that (a tablet wouldn't work well for me here)
I'm a little surprised that you are able to do all that so well simultaneously on a PC though. Whenever I've tried to do it the context switching between reading the book or other documents and whatever I'm trying to do with it kills me. Maybe it is because I've only tried to do it on laptops (I don't have a desktop PC) but I also prefer just browsing the web on my phone than on my laptop so maybe I'm just weird.
My general rule of thumb when I'm (normally) traveling a lot is that I bring one laptop-like device (MacBook, Chromebook) and one tablet-like thing (Kindle, iPad).