All of the features fantasized about in this thread you could write yourself if you wanted to and had the time and money. If the person lamenting the lack of a spreadsheet program lacks either the time or money or interest to write it, it shouldn't be much surprise that everyone else lacks them too. It is unreasonable to dismiss a system because no uncommonly charitable programmer has donated their time to write programs that they don't personally need or get paid for. Toilets are valuable enough that people pay plumbers to put them in their houses so they don't have to piss on their mattresses, but apparently no one can think of anything valuable enough about a Plan 9 word processor that they would be willing to do anything that would make it a reality.
Really none of this is specific to Plan 9 or even to computers. Maybe I should have bit my tongue, rolled my eyes, and kept quiet like I normally do.
† It does.