Every month, tech bloggers try to turn a chart like this one into a story, but most of them miss what's actually happening. You're going to see that chart a lot this week, embedded in posts that include detailed explanations of what the author thinks the underlying data points mean. Sometimes they even convince an industry analyst to share their thoughts. It's stereotypical horserace coverage. This month, everyone will be attempting to explain why Windows 10 the purple line at...
