Mind mapping is a critical application of computers, still in its infancy. I have thousands of math articles in digital form that are beyond my ability to track from memory.
My primary need isn't note-taking. I want a "Finder" alternative for managing digital assets, my own folder structure that I independently store and sync. I want to wander through old papers and open them in readers on both MacOS and iOS, at the speed of daydreaming. The timing of my herd paths, and some deliberate annotations, should be my gardening influence on a largely automated process for discovering proximities. I'm still not sure what tools to use, so I slowly write my own.