The git history of a project is the main source of knowledge on that project, once the people that wrote it are gone. The git history answers questions such as

The git history of a project is the main source of knowledge on that project, once the people that wrote it are gone. The git history answers questions such as "wtf is that supposed to do?", "what's this code connected to?", and "why did they do it that way?". You can use other kinds of documentation, but the git history is always there, so it makes sense to make it semi-useful.