Three things that could have been better about this post:
1. Too long.
2. That graph with the unlabelled red line was really distracting; I had no idea what to make of it. Similarly, the "Percent of Time Spent" had the key cut off on the right for me, so I just saw: Deskt, Mobile, Mobile. Be sure to adjust your browser width to see how you post looks at different widths, and use good graphs.
3. One thing that has to be helping Mac sales is this, yet it wasn't mentioned. IBM's had a lot of press about switching from Windows to macOS: