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All they've done is moved the freehub a little bit inboard to you can have short road bike length chainstays and still have a chainline that will work with all gears. If you run the non SCS hanger it just means you can't run little/little because the chainline is off. It's part of the stipulations from Sram and Shimano about chainline or chainstay length if you want to fit their groupsets to your bikes.
Slack
Not realised that too, would've thought they don't need to due to the longer chainstay.