I had everything to learn but it was well explained: A great introduction.

More flexibility let the configuration make logs messy, or at contrary, very clean and easy to browse... Up to the sysadmin (?). With systemd, maybe there is less risk to get messy, but all the fun (text files) goes away as well ("knock, knock, knock!").

Very neat: put the logs in a different machine and still access them even if the server crash (one reason I imagine logs can be useful).

Last thing: I wouldn't imagine logs to be this big!