"Nobody will [care] about your [...] operating system if it consistently fails to be useful for day-to-day work."
Nobody except those who already find it useful for their day-to-day work, some of whom have already explained the system's utility to them in this thread. Only if you think popularity is the only way to judge the utility of a computer operating system can you so easily dismiss such a large and influential body of work.
I posed a question earlier which you didn't address, and if you think chasing after mass appeal isn't pointless you should have an answer for: What would a word processor or web browser on Plan 9 (which everyone here seems to agree is cool) enable you to do that you can't already do elsewhere?