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SEO

Most people have no idea that hundreds of URLs from their wp-admin and wp-includesfolders end up indexed in Google and other search engines.

This should never happen. WordPress definitely needs to drop a robots.txt file that blocks access to all behind-the-scenes files and perhaps a default .htaccess file to actually enforce it.

All folders should at the very least have indexes to block directory browsing or the equivalent option set in .htaccess.

Since there's already an option of whether to share your site with search engines or not in the first place, it only seems reasonable to have it done properly should you choose to share your site.