Impossible to play on a 280hz monitor. I see you're using Date.now() to calculate the delta. Instead, use the first argument given to you by requestAnimationFrame for higher resolution, which is a DOMHighResTimeStamp[0]
The benefits are mostly realised when playing games:
* Higher refresh rates means more frames can be displayed each second by the monitor
* Lower latency between some input action (mouse, keyboard) and the frame being drawn on the monitor (provided your game can run at a matching number of frames per second; FPS)
* Synching your FPS to refresh rate (e.g. if you're game can run at a locked 280fps and your monitor is running at 280hz) will remove tearing and provide a very smooth experience
On the desktop the benefits are less pronounced: Everything just feels a bit smoother, like moving your mouse point/open windows around the monitor.
Such high refresh rate displays normally aren't very colour accurate when compared to displays used for media editing.