Your Reputation data can help you in many ways.
Spam trap and suspicious mail data can help diagnose list acquisition, list hygiene and list engagement issues for a particular sender, ip address, or list. Based on the total hit counts over time, along with trap type and trap age, senders can determine likely causes for the hits.
Data from Microsoft SNDS, Signal Spam and feedback loops can flag complaint issues that may indicate whether your campaigns are relevant to your subscribers. High complaint rates can lead to your campaigns being filtered out of the inbox or even blocked by the mailbox provider.
Google Postmaster Tools data can give you information about your IP and domain reputation at Gmail and G Suite, as well as authentication and complaint data. You can use these factors to pinpoint any deliverability issues you may be experiencing at these addresses. For example, you may adjust your DMARC policy based on passing issues, or the user-reported spam rate may tell you to make your content more relevant or take another look at your list acquisition practices.