[krastanov]

I am surprised anyone would want reflow in their PDFs (that is what epub is for). The PDFs I read would be completely ruined even by minor reflow (e.g. I work with two-column text with many inline figures and math). PDF inherently as a format is not meant to have reflow.

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).

[Shorel]

The only reason I can think of, is people being unaware of ePub existence.

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.

[ipsum2]

Reflow is offered by Adobe: https://blog.adobe.com/en/publish/2020/09/23/adobe-unveils-a...

Unfortunately you have to send the file to their servers, which is probably a no-go for many.