Q) What's the difference between a blocking comment and a "normal" comment + rejecting the PR?
C) Exposing metrics like "Review time per reviewer" may, at the wrong hands, incentivise the wrong behavior. For example, a team lead may view long review times by a particular reviewer as them being slow, whereas they are just more thorough. Tracking the total review time for the PR (aggregating the times from multiple reviewers) is more useful.
Q) What's the difference between a blocking comment and a "normal" comment + rejecting the PR?
C) Exposing metrics like "Review time per reviewer" may, at the wrong hands, incentivise the wrong behavior. For example, a team lead may view long review times by a particular reviewer as them being slow, whereas they are just more thorough. Tracking the total review time for the PR (aggregating the times from multiple reviewers) is more useful.