I fear that I might be starting a flame war, but ...
I have been using Plan9 (and Inferno to a lesser extent) on and off for about two decades. The concepts are very enticing. But like any other niche OS (e.g. Minix) the biggest stumbling block seems to be device drivers. And display adaptors are one of the most challenging for device drivers which in turn means that anything that depends on X, etc is going to be a challenge. Sound cards, etc are almost as bad.
For these reasons Plan9 struggles to become more widely adopted as a desktop system and in turn porting programs is either taken on as a challenge or labour of love. So it is not surprising that the utilities that you mention are lagging behind the ports to more widely used platforms.
To answer your question, there are a some people who use Plan9 seriously, but I doubt that their numbers will ever become much larger. Personally, I would like to use Plan9 for servers, but due to the development toolchain issues I keep going back to Linux variants.
Wishing you continued with your adventure series.