I switched to Linux about 2 months ago specifically to take advantage of powerful WMs. My WM of choice handles the "always on top, small video window in the corner" beautifully. It also works with any app, and any video service, where Firefox's has to be custom tailored to different scenarios.
It all makes me wonder why both Windows and OSX are so unwilling to either explore more powerful window management, or at least provide APIs to enable power users to build their own.
It all makes me wonder why both Windows and OSX are so unwilling to either explore more powerful window management, or at least provide APIs to enable power users to build their own.