Print is procedural. Old programming languages were like that:
BEGIN PAYROLL
OPEN EMPLOYEE-FILE
START
READ LASTNAME, FIRSTNAME, HOURS
and so on. You start here and you work to the end. Print is like that. The publisher gets an idea for a book and the editor finds a writer and all that happens and the book gets sold and it is over. Nothing good can interrupt that.
So, online numismatic writing is interrupt driven. It is true that it is also procedural. I still write the old print essay kind of posts and really they stand out as being different from everything else online. When someone asks a question, a longer answer can be all right, but after a screen, you better be pretty darned interesting.
"What Did the Postman Bring?" is another kind of process. In other words, someone has a good idea for a topic and other people contribute to it. That is not the way most books are created, though some are. There are "festschrifts" (celebration writings) where to honor someone, their students get together and publish a book of new essays in honor of their mentor. But that is kind of limited. The ANA used to publish compendium books, but knowledge moved beyond them rather quickly.
In print, we call them "readers" and online, they are "lurkers." The assumption online is that you are a particpant. Poster -- though the minority position -- is the default. That is not true in print.
Print is like a college classroom where an expert tells you what they want you to know. Online is more like industrial training where the experts are in the audience and the facilitator is just helping things along.