PiP has greatly improved my Zwift+Netflix experience. Zwift is a "fitness game" that is best enjoyed with a TV stream alongside (sorry Zwift, you're not that engaging), that like most games doesn't really support arbitrary aspect ratio and that is best enjoyed on the big TV screen. It can easily tolerated some of its UI getting obscured but you do want to keep it focused for possible key events. Before PiP arranging those windows was a permanent struggle with focus and tricks to hide as much of the browser UI as possible (not much). It's still not perfect because PiP is reset between episodes, but I don't expect this to remain a problem forever.