Like, take this query for example: show me the folder(s), where my old University projects are stored. How would an AI, however powerful, know what are "university projects" if they aren't tagged as such? And if they were, why is the AI necessary?

One approach I've tried before is: if you have a folder /projects/ with so many project folders in it that you don't even know anymore what is what anymore, you just create a text file called /projects/index.txt and write the name of each folder in there and what it's for, so you don't forget later.