On the Wordpress Codex: Moving Site page under Changing Your Domain Name and URLs, it states that you should re-download your site files (Step 5) after changing your site URLs (Step 4). Is Step 5 actually necessary? Wouldn't changing the site URLs only impact the database?
Download your existing site files.
Export your database - go in to mySQL and export the database.
Move the backed up files and database into a new folder - somewhere safe - this is your site backup.
Download your site files again.
Export the database again.
Edit wp-config.php with the new server's mySQL database name, user and password.
Upload the files.
Import the database on the new server.
If it is necessary to re-download the site files, would it only be the
root folder and
/wp-content folder that might have changes? Aren't those the only areas where changes are made to Wordpress' core files?