A-Frame defaults the desktop drag (which acts as a preview for VR experiences) to dragging the camera. For static scenes such as panorama, it can feel weird, but A-Frame does have options now to reverse the drag direction. But when you're building 3D scenes and using WASD, it feels more natural to drag the camera.

Pointer lock should be done, but we count the desktop drag as a non-invasive preview mode, but experiences can implement pointer lock if they need.