>How often, truly, do you find yourself wanting to link a task in your todo list app to a file in Dropbox

Links are much more useful once notes and todo lists are shared and published. I am surprised that not all tools for thought have standardized on ActivityPub to enable their users to connect each other's notes. People with an account could correct mistakes or link to crucial knowledge that was overlooked.

Like Wikipedia, information would grow "on its own". Important ideas could be identified, information could be collected until it is enough for further steps.

Zettelkasten is great for one person but that's for prolific people who process a massive amount of information. With the internet, a group of average people can turn into a genius by collectively collecting information and turning it into a useful form.