Those are good reasons, but the subtext of the parent post is how absolutely intractable IE's share has been for years, despite (once) poor performance and being appallingly behind the curve on new features (tabs, extensions, etc.). Google's own research showed that users didn't even understand the abstraction of a browser application - they were simply "ummm, on the internet".

Clearly, Google made headway on these issues, but I think you underestimate how profound consumers needed (and still need) to be educated that they even have a choice of web browsers and that choice impacts their daily web experience.