Since you can readily scale a microkernel OS simply by including or omitting the particular processes that provide the functionality required, you can use a single microkernel OS for a much wider range of purposes than you can a realtime executive.
Product development often takes the form of creating a “product line,” with successive models providing greater functionality. Rather than be forced to change operating systems for each version of the product, developers using a microkernel OS can easily scale the system as needed—by adding filesystems, networking, graphical user interfaces, and other technologies.
Some of the advantages to this scalable approach include: