That's fair. But I think the core point here is that, as with much of the Plan 9 design, by including a more elegant and powerful abstraction in the core desig

That's fair. But I think the core point here is that, as with much of the Plan 9 design, by including a more elegant and powerful abstraction in the core design, the need for a much more powerful and much more complicated abstraction layer on was obviated, if not eliminated.