Because a typical copy can copy millions of files, and having a log with millions of file copy statements isn't very useful.
The "current file being copied" is, in my opinion, visual noise that I also don't think is important or useful in most situations. I do have an idea that would show a filename when it's taking an especially long time to copy a specific file, but that's significantly different than showing every one - which I don't want to do.
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--Dave Nanian
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