DSUClients are tools that allow you to fully utilize your controller over a server, allowing you to fully use functions such as motion controls in a SixAxis, Dualshock 3/4, DualSense, wii remote and all switch controllers, the touch pad on the DualShock 4 and DualSense, and HD rumble in switch controllers

The main use case for DSUClients would be gyro camera controls, which are superior in comfort (since you can just keep your right thumb on the face buttons) and functionality (no stick gate and three instead of two dimensions) and touchpad hotbar management (can free up L and R)