I use PiP in Safari, and I find it useful for watching a video in a small window in the corner of my screen without having to keep the page the video was on (Yo

I use PiP in Safari, and I find it useful for watching a video in a small window in the corner of my screen without having to keep the page the video was on (YouTube, etc.) open. That way, I can watch the video while reading other tabs, or working in other windows. It's nice because PiP (at least Safari's/macOS' implementation) keeps the video above all other windows, and it even carries over into other Spaces. In short: multitasking.