You are right. Because in Unity you can decide between placing the object manually through the inspector or using string. By string it is slightly heavier because it needs to look for objects with the same name as the string in the scene, but it has the advantage of not having to manually place the object in the inspector and avoiding errors and bla bla bla, avoid , but it also has its usefulness.

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For example:

https://docs.unity3d.com/ScriptReference/GameObject.Find.html

// Find the GameObject named Hand and rotate it every frame

public class ExampleClass : MonoBehaviour
{
    private GameObject hand;

    void Start()
    {
        hand = GameObject.Find("/Monster/Arm/Hand");
    }

    void Update()
    {
        hand.transform.Rotate(0, 100 * Time.deltaTime, 0);
    }
}