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In GDScript 3.0, when working with signals, what is the primary advantage of using `connect_method` with a callable compared to directly connecting a method name string?
Consider a scenario where you have a parent node with a `Node2D` child that needs to dynamically change its `position` based on user input. If you attempt to access `get_node("ChildNode").position` within the `_process` function of the parent and the child node is not yet ready or has been removed, what is the most robust GDScript 3.0 approach to handle this?
In the context of GDScript 3.0's Object-Oriented Programming features, what is the fundamental difference between an `export` variable and a regular variable when it comes to their scope and accessibility within the Godot editor?
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