Microkernel itself is hard to build but this is some thing such a difference between waterfall and RUP in Software Engineering. In monolithic kernels we do not have any architecture (because it is monolithic) but in micro approach we have a architecture and we must bound our mind on it and building an architecture that support all of our need of future is so hard and only comes from academic researches or big companies. This architecture must work for at least 5 years and must have some opportunity to be extensible.
For example search the Internet and you will find so little number of dead or alive microkernels that only comes with support of some (only) programmers.
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