I find laptops (let alone phones) fairly unpleasant for anything resembling a comic. You really need a 4k monitor at least the size of a physical page. That usually implies portrait orientation, and then a second one for spreads, at which point just give up and use a large format tv. Or better yet just stick to paper.

I also have this problem with the scientific literature. Tablets let alone ereaders just don't cut it.

What I've long wished for but it doesn't seem to exist is a high resolution full color epaper tablet the size of a hardcover textbook page with a sub-second refresh time. Not live video or anything, 500 ms or so would be bearable for quickly panning around a document.

I read manga on my kobo elipsa 2e (10" 227 PPI, 1404 x 1872 resolution) often and find the experience quite good. I specifically got that e-reader since it has a big e-ink screen. Manga is mostly black and white anyway and the color pages get shown in grayscale, that works relatively well. I suppose traditional comics also work well since they have black text on white background the color to grayscale may cover some detail but should definitely be readable. most color comics and manga are printed in 300 PPI.

KCC has a feature to combine spreads that I added, I think it works pretty well, photos in readme.

After combining you can autorotate it or not, it’s an option.

I also read a lot of manga and comic, but for me the tablet is the ideal experience. I can't read hundreds of pages, while travelling, on physical volumes.

Yes, I agree, eink is so close to physical paper. I have shelves of physical manga but eink is close enough to that experience for me.

There are a lot of koreader plugins that implement individual features. Any in particular you want?

But I prefer to preprocess on a pc to maximize ereader battery life.