Perhaps of interest here, would not be a specific OER text, but an OER zettelkasten or card index that indexes a variety of potential public domain or open resources, articles, pieces, primary documents, or other short readings which could then be aggregated and tagged to allow for a teacher or student to create their own personalized OER text for a particular area of work.

If done well, a professor might then pick and choose from a wide variety of resources to build their own reader to highlight or supplement the material they're teaching. This could allow a wider variety of thinking and interlinking of ideas. With such a regiment, teachers are less likely to become bored with their material and might help to actively create new ideas and research lines as they teach.

Students could then be tasked with and guided to creating a level of cohesiveness to their readings as they progress rather than being served up a pre-prepared meal with a layer of preconceived notions and frameworks imposed upon the text by a single voice.

This could encourage students to develop their own voices as well as to look at materials more critically as they proceed rather than being spoon fed calcified ideas.

There is lots of serendipity here, particularly when people are willing to either share their knowledge or feel compelled to share it as part of an imagined life "competition" or even low forms of mansplaining, though this last tends to be called this when the ultimate idea isn't serendipitous but potentially so commonly known that there is no insight in the information.

This sort of "public serendipity" or "group serendipity" is nice because it means that much of the work of discovery and connecting ideas is done by others against your own work rather that you sorting/searching through your own more limited realm of work to potentially create it.

Group focused combinatorial creativity can be dramatically more powerful than that done on one's own. This can be part of the major value behind public digital gardens, zettelkasten, etc.