Think its important to note here that you can use any tool and technology here (incl. pieces of paper by topic). I found that most prolific thinkers never used a PKM but have their own and usually very simple systems to take on information that is important to them and use it in the future.

Most people I've noticed that are successful and productive in their respective fields have very simple systems. Using simple systems prevents productivity porn, the act of over gardening your tool sheds. It prevents you from wasting time in things you shouldn't be wasting time on - chasing technology and processes instead of saving problems for instance.

They also publish mostly finished work (not necessarily perfect) semi frequently. These works could be blog posts, websites, YouTube videos, books, and a whole host of other things depending on what's being produced

This and 10x this :)