I was discussing the lead in with a colleague last week. There are just so many threads to how we arrived at where we are today simply in terms of operating systems. You could probably have a whole podcast series on that alone. I once helped write an expert witness report that tried to bring in all the AT&T, BSD, Unix Wars, etc. threads and it was hard to keep it comprehensible. Keeping it around Microsoft and Apple in their modern forms probably makes it more approachable for a broader audience.