Just because people are adding it to things doesn’t mean it’s any good. Most distros pipe all of their audio over TCP for absolutely no good reason too, also at the hands of Pottering.
Because most people want a Lindows, not Linux. And a Lindows they got, with many pros and cons of Windows. Linux users will always be a minority because Linux is about tinkering and customization instead of a consistent corporation-concocted UX.