>This architecture sounds old to me, as in things were built like that in the 80s or earlier but evolved past.
Actually most modern OSes in use are even older in their concepts.
Plan 9's concepts as described above have slowly creeped into Linux but not fully. So the architecture above was only experimental in the 80s/90s and is still nowhere available in the mainstream today.
So your concern is like saying "we've had macros and closures since the 70s" in a world that still uses Java/C#/etc.
Actually most modern OSes in use are even older in their concepts.
Plan 9's concepts as described above have slowly creeped into Linux but not fully. So the architecture above was only experimental in the 80s/90s and is still nowhere available in the mainstream today.
So your concern is like saying "we've had macros and closures since the 70s" in a world that still uses Java/C#/etc.