You will be shown an excerpt from a computer science scientific research paper, followed by a question about the paper. Please answer the question. Do not include any text in your response other than the answer.

Context: We adopt a much simpler approach for SQuAD compared to past work.In particular, while both BERT Devlin et al. (2019) and XLNet Yang et al. (2019) augment their training data with additional QA datasets, we only finetune RoBERTa using the provided SQuAD training data.Yang et al. (2019) also employed a custom layer-wise learning rate schedule to finetune XLNet, while we use the same learning rate for all layers.

Question: Why author said that they adopt a much simpler approach for SQuAD compared to past work?
Author said that they adopt a much simpler approach for SQuAD compared to past work to emphasize that they only finetune RoBERTa using the SQuAD training data, and they use the same learning rate for all layers, not like previous works.