There is definitely a reason for this. This is how the application installs the default templates into your Data Store, in particular after an upgrade if templates have been updated in the new version. Because the installation of the application is completely separate, it only installs the templates into the application's installation folder, which can no longer be used for user data. Therefore, the templates must be copied to your Data Store by the application. I can see how that might be frustrating if you want to keep those out of your Data Store, but there's no way to prevent it.