One still cannot ignore the fact that Unix and Plan 9 offer two
completely different approaches to displaying text. I think it also
would not be very productive nor it was intended to use Plan 9 without
mouse and rio(1).
I spent four years using Plan 9 on the Blue Gene supercomputer (I led the team that did the port). I also spent years using it on embedded systems with no windowing system at all.
What you're saying does not accord with anything I experienced with Plan 9 over a dozen year span. I also don't believe your claims are driven by experience using Plan 9; am I missing something? What is the basis of your statement?