@HatkeshiatorTND @matthew I have a 9front VM running to make experiments. But using it as my desktop? Nah. Rio and Acme are too much of a pain to use for me.
If you were asking why use rc23 instead of plan9 rc, well rc23 has a bunch of features that make it much more usable on UNIX/Linux, including a proper readline integration, and automatic handling of $HOME and $PATH.