Most representations are haphazardly created (math notation, periodic table of elements, etc) by (often) singular experimentation. Representations are poorly researched and understood (there's no branch of science dedicated to them). If representations were studied more closely, we could get much better at deliberately creating representations that are more humane. When the scientific method is applied, we can then apply the engineering method to create new things from those principles. Bret's talk is a great, accessible overview of these ideas from his context (https://www.youtube.com/watch?v=agOdP2Bmieg).

To vastly oversimplify things, one way to improve accessibility is to parallelize representations that live in just 1 or 2 sensory modalities to all of our sensory modalities. This way, math notation could be made accessible to & equally powerful to the blind (as it is to those who can see).

I empathize (a little, it would be naive for me to assume I can 100% empathize) with your reaction along the axis of accessibility. What Dynamicland looks like right now isn't what it's going to look like later. Right now, you may see Dynamicland as text boxes but now distributed in a room. In 50 or 100 years, there may be no text AT ALL and you can use the senses available to you to interact with information.

To paint another perspective, I would argue that current computing environments are VERY in-accessible for many people. Laptops and desktops only tap into our visual and symbolic channels, with some tactile feedback (but quite minimal, we know where "X" is on the keyboard b/c of spatial reasoning not b/c the X key gives us specific/unique tactile feedback). Humans who thrive in spatial and kinesthetic channels are debilitated on a modern computer.