> reliably communicate some of the nested arboreal complexities
Text/Subtext, text/'direct' and implied meaning, maybe?
I don't think 2D refers to conventional dimensions but to a dimensional structure implicit to text as an object made of objects, nested and nesting all the way up and down.
Weird. I was just having a similar discussion with my colleagues regarding coding style. Anyways, I absolutely view text (code more than prose; but poesy definitely has this!) to be 2D. There is both per-line and interline structure that good formatting surfaces; it simplifies long range reasoning about invariants.
I mean... the whole field of typographic ad copy is about 2D writing?