Frankly no, it doesn’t re-flow them so the text will often be too small. Quite a massive oversight and no one really talks about it.
With that context, I love reading PDFs on my remarkable 2. Zooming and panning also works pretty well (given the slow refresh rate of e-ink).
Unfortunately you have to send the file to their servers, which is probably a no-go for many.
I agree with you. If you want something that can be reflowed, get the ePub version. Or, if it's meant to be made from images, get the CBZ version.
Probably quite long. I remember a discussion here on HN a while ago where it was said e-ink displays are expensive since there's no economy of scale and there are only a few manufacturers. Now for larger displays the demand is even lower, so prices tend to be even steeper.