I think it's a symptom of what a lot of people suspect - limited dev time and resources to "convert" SH III into SH IV. It's safer to leave "unused" files where they are than to start deleting stuff, especially when you're in a hurry, working to a release deadline and on a tight budget. Not only would the devs have to test the new stuff as it was included, but would have had to re-test after deleting the redundant files to make sure they hadn't changed anything because of the deletion.
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