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Perfectly sensible to have marketing writers and UX writers, with the former focused on emails and ad copy and the like, and the latter focused on product copy. But please don't perfectly silo them, or pretend marketing content isn't part of the user's experience.
Same thing applies for people who write for user support. They tend to be siloed, but they are also a part of the experience.
Absolutely.
Product support is part of the product.
I know that @Patrispat is sooooo gonna frame that tweet. 
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