I'm one of about 2 people at my company who goes on archaeological expeditions to understand when and why a bug was introduced. A nonzero number of times, I have found that the behavior was introduced on purpose over a decade ago, and sometimes it's addressing an edge case I didn't think about. History is valuable!
(unfortunately the most common usage for me though is as a 'smell test' where I learn who wrote the code from the history and then decide based on my existing assessment of their skills, how suspicious I should be of that code)
e; oh yeah one more story that's kinda funny. Just this week I saw some behavior that I didn't like and went to look at the code's history. I was the one who wrote the code I didn't like. But I had left a good enough comment on it that I realized there actually was no issue at all and my expectations were incorrect.