Microkernels in general make for a great case-study on why arbitrary flexibility may not provide user value. Most of the OS doesn't have a need for "alien," rad

Microkernels in general make for a great case-study on why arbitrary flexibility may not provide user value. Most of the OS doesn't have a need for "alien," radically innovative subsystem development - improvements to things like scheduling are mostly incremental in nature. Filesystems are one of the huge exceptions to this rule.