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The reason for the convertibility of variable types in a Groovy class is to provide flexibility and easy-to-use syntax for developers. Groovy is a dynamically-typed language, which means that it allows variables to be assigned different data types at runtime. This is possible because Groovy automatically converts one data type to another as needed, without requiring the developer to specify the conversion explicitly. This feature reduces the amount of code that needs to be written, making the language more concise and easier to read. In addition, it allows developers to easily write code that can handle different data types without having to add a lot of conditional logic or type checks.