Could you give an example (or a link) that demonstrates this higher-dimensional syntax? Are there things you can express with it that couldn't be expressed in S-expressions?
> Are there things you can express with it that couldn't be expressed in S-expressions?
No. But that may be like asking "is there something I can do with the x86 that I couldn't do with any Turing Machine?" Pragmatically speaking when you factor in UX and time there are things that are dramatically faster with Tree Notation versus S-Expressions.
Lots of things that are muscle memory to Excel users (drag to fill, copy/paste blocks, move columns and rows, et cetera), would be very ugly/hard to do if we were using paren based S-Expression notation.