Many writers have devised lots of little systems, and the fact that everyone into PKM mentions this one guy supports my argument. What percentage of history's greatest and most prolific writers did not use a Zettelkasten? More than 99%, probably. Luhmann is an exception that proves the rule.

We still do not understand how information practices from the worlds of learning, finance, industry, and administration cross-pollinated. From the fourteenth century onward, accountants developed complex instructions for note-taking to describe holdings and transactions, as well for the recording of numbers and calculations. By the seventeenth century, merchants, and indeed ship captains, engineers, and state administrators, were known to travel with trunks of memoranda, massive inventories, scrap books, and various ledgers and log books that mixed descriptive notes and numbers. By the eighteenth century, tables and printed forms cut down on the need for notes and required less description and more systematic numerical notes. Notaries also were master information handlers, creating archives for their legal and financial documents and cross-referencing catalogue systems.

valorization of waste chemicals accumulating in industry is one of the pillars of the circular economy and the 4th Industrial Revolution