In the current implementation of torch.onnx.export(..., dynamo=True), certain TorchScript-based operations are not supported. To ensure a smooth user experience, we should implement an automatic fallback mechanism with a deprecation warning. This fallback should handle cases where only the TorchScript-based exporter can process the export, such as:

1. When the input model is a torch.jit.ScriptModule or torch.jit.ScriptFunction, as these are specifically designed for TorchScript.
2. When custom_opsets is provided, since torch.onnx.export(..., dynamo=True) uses custom_translation_table instead.
3. When dynamic_axes is provided, because the automatic conversion of dynamic_axes to dynamic_shapes does not cover all scenarios.