When first creating Linux, why did its creators choose to build a non-preemptible kernel? On a machine with just one CPU, why would you want a non-preemptible kernel? In contrast, why does the benefit decrease while using many processors simultaneously?

When creating Linux, why did its creators choose with a kernel that doesn't allow for preemptive multitasking? In a single-processor system, why would you want to use a non-preemptible kernel? But why does employing a system with several processors reduce the value?

The original Linux developers built a non-preemptible kernel for unknown reasons.In a setup with just one CPU, what good does a non-preemptible kernel do? However, with a system with several processors, why does this benefit decrease?

Linux creators opted for a non-preemptible kernel from the outset because...Can you explain the benefits of a non-preemptible kernel on a single-processor computer? Why does the benefit decrease as the number of processors used increases?