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Visually, using delta time to obtain framerate independence is sufficient. But for physical interactions, a changing delta value may make the calculations inconsistent.
Physics Process Function
_physics_process() is a special function in the Godot engine that is called every physics frame. Contrary to the _process() function, which is called as many times as possible, the engine tries to ensure that _physics_process() is called at a fixed interval, and that the delta time passed to it is constant._physics_process() for all interactions between elements that involve collisions, forces, or other physics-related calculations. For example, movement, jumping, shooting, and so on should always be handled in the physics process.