At a previous org, I discovered most of the product management folks did not have access to github. So if someone (not an engineer) was trying to figure out why Joe changed feature X, they couldn't do it with a PR. They only had access to Jira.
Edit to add: But also it seems like there are two things going on in this thread. On the one hand, the reason for tickets is (supposedly) for a compliance audit log. And surely the auditing system could read from both Jira and GitHub. But this question of what product managers can access is a different one. I think the more likely reason for these rules is for "product managers" who are really acting as project managers and are trying to micromanage through tickets.
