Windows does it because the vast majority of functionality is not implemented in the kernel per se, but rather in user space by preference for stability. Even t

Windows does it because the vast majority of functionality is not implemented in the kernel per se, but rather in user space by preference for stability. Even things like display drivers are often primarily implemented in userspace. The main advantage of not having a stable kernel ABI is that you have the freedom to change it for security/performance reasons. This means the OS can change how they implement things over time without breaking things as easily. MS is notorious for this and for using this fact to allow them to 'emulate' older ways of doing things even when the real implementation has long since moved on. The main advantage of having a stable kernel ABI is that the userspace can be whatever the developer wants it to be realistically. If they want it to be just a single GO program and literally nothing else they can do that (routers are a good example of devices that do this).