Could you expand on what you see as exciting developments? I’ll have to check out the op post link as well as yours and others in the thread.

It’s been a few years since I seriously looked at options for my personal use, but I remember being quite disappointed in the options I found. Zotero and org-noter seemed two of the best (though in completely different ways) pieces of software I could find regarding reading or organizing pdfs. I trialed OneNote for a year and liked it in the moment, but zero support for navigation or discovery or review of information make it untenable for building a knowledge base or doing literature review.

I imagine that software which makes reading and connecting document information (in any form: pdf, html, video or other) could be so much better than what I use daily.