Thanks so much for your thoughts, plusz!
The news about jump points is indeed welcome. If I am understanding correctly, the <> buttons only remember jump points, so you can browse pages with a normal edge tap freely and still use <> to get to jumped-to points? That is really cool! And the page number jumping technique sounds clever, too.
I would really really appreciate it if you could record an example, but I understand if you'd rather not because it is quite a time commitment.
A smaller example would be if you Googled "imperial assault manual pdf" and downloaded the second link (titled Rules Reference Guide - this file is made freely available, and indeed hosted, by its publisher).
The real acid test would be a D&D core rulebook, and I can't really think of anything similar. It's ~300 pages of full-page images with many complex sub-images, tables and complex flowed text. The fifth edition Player's Handbook is 95mb. A "dnd 5e pdf" Google would find it but I understand if you'd rather not.
In any case, thanks very much for the feedback, I really appreciate it!