That's a good reason to include license terms in each file. I don't think that Wordpress people were malicious here. The LICENSE file usually contains the global licensing terms (as seen in many GNU projects). Each source file should still contain the license or a mention of the license. MIT-like licenses are usually put verbatim in each files, while verbose licenses like GPL just get a pointer to the LICENSE file.

On some files, the MIT license is correctly present at the top of the file:

https://github.com/wordpress-mobile/WordPress-Editor-iOS/blo...