What are the four key takeaways from the creation of MINIX, and how do they apply to the current state of operating system development?

What is the impetus behind the development of an operating system's microkernel? Is this distinct from the modular approach?

What are the four most important lessons learned from the development of MINIX, and how do they relate to the condition of operating system development today?

In what ways might the four most important lessons learned from MINIX's development inform the present status of operating system creation?