LANGUAGE IS SEQUENTIAL; IDEAS AREN'T.
Human languages are arranged one-dimensionally: one word follows another, no two ever occupy the same moment in time (for speech) or same place on the page (for text), and the chains of words cannot branch. The format of sentences and pages and speeches does not allow for simultaneity or parallel chains.
That's mostly fine. Language as we use it is well-adapted for conveying a particular string of ideas, a single path through the possibility space of things-that-could-be-said, and that is the most useful primary function of communication. It is not a well-adapted structure for fully mapping possibility space, though - like trying to make a map of a country by writing down the paths a number of individual people happened to take when they walked through it. Land (surface) is two-dimensional, and a useful map of it must be able to communicate the 2D relationships of places, not force its users to take in dozens of sequential threads and construct in their own minds the relationships that tie them together.
Idea space is also, often, multi-dimensional. A useful map of a full idea space would show the relationships between chains of ideas, not just collect a bunch of sequences together without providing any kind of meta-structure to give context and coherence.
We need a multi-dimensional format to map our ideas in. We are no longer constrained by primitive writing and printing media; software and the internet have given us access to flexible, dynamic, collaborative spaces that can take on almost any shape we can imagine, and we need only imagine shapes that are powerful, informative, and intuitive. When we do, much that was abstract, confusing, and difficult, will become concrete, clear, and simple(r).
This will be a big deal. Access not merely to information, but to the understanding of information, is what drives progress: lower the barriers to entry and you expand the number of minds that are able to benefit from, participate in, and contribute to a field. Increase the clarity and depth of even the best minds' understanding, and you expand the range of what it's humanly possible to imagine and conceive.