Yes! My company has source that is 20-30 years old, sometimes just going through the history to see who has committed on it and checking if that person is still

Yes! My company has source that is 20-30 years old, sometimes just going through the history to see who has committed on it and checking if that person is still in the company is already a win, other times there's a code review link or a ticket system link that gives possibly more context to why something was made. (Granted code review systems and ticket systems change overtime) Git blame on gitlab is also a good way of getting context of why something is there to begin with.