In Apple's case, the lost relevance of one platform lead to the increase in relevance of another one - that they controlled. Microsoft has no such "luck". Also

In Apple's case, the lost relevance of one platform lead to the increase in relevance of another one - that they controlled. Microsoft has no such "luck". Also, it does matter, because there's over a billion Windows PCs in active use. It's still relevant, but it's getting eroded. That's a huge issue.