A financial services company is developing an AI system to help auditors review complex expense reports. A primary requirement is that human auditors must be able to understand and verify the system's decision-making process for every report to ensure compliance and defend audit findings. A developer suggests using a language model that processes a report and outputs only a final 'approve' or 'reject' decision, with the logical steps for the decision being processed internally but not displayed. Evaluate the suitability of this proposed approach for the company's needs and justify your conclusion.