No. Feel free to check if there’s an existing feature request or create one if not. The closest I could find is the following: Feature Request: Ability to Copy/Duplicate IF Conditions
Variables are uniquely identified by their variableId. As you noted, you can delete and recreate a variable with a new name. But the rules themselves are referring to the variable by it’s unique ID, so if you are ‘renaming’ the variable but keeping its existing purpose, you would have to update your rules accordingly.