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The reason for not calling this method on the main thread is that it can potentially block the main thread and make the UI unresponsive. This is because the main thread is responsible for handling user interface updates and events. If a long-running or blocking operation is performed on the main thread, the UI will not be able to update or respond to user input until the operation is complete.

This can result in a poor user experience, as the application may appear to hang or freeze. To avoid this, it is recommended to perform any long-running or blocking operations in a separate thread or background task, leaving the main thread free to handle user interface updates and events. This allows the UI to remain responsive and provides a smoother user experience.