Server logs and crawl exports are written oldest first. When something broke recently, the relevant entries are at the bottom of a very long file.
Flip it and read normally
Reversing puts the most recent activity at the top. For any question about what just happened, that is where the investigation should start.
Where this matters most
Diagnosing a sudden change — a traffic drop, a crawl error spike, a redirect that stopped working. The useful evidence is the most recent, and reading a hundred thousand rows of history first to reach it wastes the time you have.
Reverse, then filter
Reversing first and filtering second gives you the most recent matches immediately. Filtering first on a large file still requires reading it all, but the output is small enough that the order is easy to fix afterwards either way.
Try it: Reverse Line Order on SeoWolf's Notepad.