Revision history is essential for traceability in safety critical work. The entire history with name and timestamps can show both who introduced a problem, but

Revision history is essential for traceability in safety critical work. The entire history with name and timestamps can show both who introduced a problem, but also gives context for how a more subtle architectural issue got baked in slowly over time by multiple people. It can then be fixed, and possibly the process can be updated to help avoid such hard to spot issues in the future.