My use case, as a third party tool, is to define if a PR can be merged based on the CI flags and humans comments (score).

In pagure user can add thumbsup and thumbdown to PR's comment and a project's owner can define a minimal score under the one pagure will enable the merge button.

Currently, the score is computed from all the comments but a single commit can bring so much change to a PR. It would be safer to compute the score from the comments added after the commit_start date to be sure reviewers approved the last updated code.