I respectfully don't consider the creators you described as "power users" in Parent's sense. What they do are mostly "productivity porn", i.e., fiddling with to

I respectfully don't consider the creators you described as "power users" in Parent's sense. What they do are mostly "productivity porn", i.e., fiddling with tools in a vacuum, without real professional contexts, and severing flaunting, sensual purposes. It's writing scripts for automating errands that I consider power user's workflow; decorating zettelkasten "gardens" filled with teaching from yet another productivity guru -- not so much.