Log files & the systemd journal do the same thing in different ways. They keep a record of everything that happens on your computer system. This makes it possible to understand what is going right & what is going wrong. As an example, if your system had been infiltrated by an ssh attack, this could be verified in the log/journal. So these log files are good for more than tracking troublesome hardware, or driver problems, badly written network manager code or the plethora of other problems that the complex & dynamic GNU/Linux system has to deal with.
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