Maybe I’m just not a very insightful person, but I can’t imagine ever having so many original and valuable thoughts that I’d need a place to store them. In fact, many of the things I think end up being wrong, so I’d rather use the Internet as my “PKMS” since it is more likely to refine what I think I know.
Granted, I am neurodivergent and have memory issues, so it’s hard for me to say what use it’d be to anyone else. But like, if you’re doing research into something deep, experiments, etc , and you have to put it down sometimes, it’s nice to be able to pick up right after you left off.