Your point is very helpful. The scroll mode support is in the next update bucket list and hope that will help you copy the content properly.
For bookmarking purpose, your can just bookmark the page you're looking at and then visiting it later will bring you the same (or almost same depending on device side) page. Hope that is of any value to you.
Thanks.
The UI is not "unseen" either: there are grey divider lines between UI components, and the expected interaction is not even hinted at.
How do I copy a paragraph that spans page boundaries? How do I bookmark a section of interest in a longer article?