It's not even a CSM thing -- it's specifically a Death Guard thing.
Obviously, their shop, their rules, but I think it's a little silly. The core rules no longer have strict WYSIWYG rules, but it's pretty ingrained in a lot of places.
(Unrelated, but chainswords are super common. If you can't get one for free, I'd be more than happy to mail you one. Feel free to PM me of you want it.)
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