Thread:Barubar/@comment-4651179-20190824194623/@comment-4651179-20190824205251

You need to take into account that a wiki is not made by its contributors for themselves, but to readers that are not necessarily familiar with the site's contents.

While the filename includes the image's source, it forces the reader to either hover over the image (if they're on desktop), click on it, or open it in another tab. And this only works under the assumption that the reader already knows that the image's source is included in the filename. Furthermore, if the reader wants to go to the image's source, they'd have to go to the file's own page. It's much easier to include a direct link to the image's source right under the image as it appears in the gallery.

I hope this clears it up.