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The GNU Hurd has a lot of [[advantages]], but there are challenges, too.
Some of these are explained in the [[hurd/critique]].
Even though they're quite popular in the simpler embedded space, there is no successful true multi-server [[microkernel]] system for general-purpose desktop use yet. This is still an ongoing research effort. (TODO: add references.)
Likewise, resource scheduling in distributed operating system kernels is a research topic. For example, read more about it on the relevant [[Open Issues page|open_issues/multiprocessing]]. Also, the [[microkernel/Viengoos]] research kernel project strives to explore these.
TODO: more to come. [[!tag open_issue_documentation]]