Why is the leveling castors with handle more convenient to use than the ordinary one?

Why is the leveling castors with handle more convenient to use than the ordinary one? As we all know, the ordinary leveling wheel is to extend or lift the base by rotating the gear block or nut on the central axis screw rod, so as to control the movement and locking state of the caster. Because the base has a telescopic function, it is also called adjustable height leveling casters or retractable leveling casters. The space for this operation is generally limited, so the operation of the ordinary level adjustment wheel is relatively inconvenient, especially when heavy objects are pressed on it.
Why is a leveling wheel with a handle more convenient? We all know the principle of arch rods, the same object, when the fulcrum is fixed, the longer the rod, the less force required to pry the object. Handles are much longer than both gears and nuts and require less force. And it usually sticks out of the caster housing, and the operating space is larger. And the end of the handle is also equipped with a round hole, if necessary, you can use other small rods to insert the extended arch rod, which is more labor-saving.
Ordinary leveling casters are often equipped with a small wrench to assist operation, while the one with handles are not.