This may sound obvious: a designer is responsible for design, right? By design, I’m talking about not just how something looks, but also how it manifests the solution to the problem it solves. Remember that nice young designer who worked at a big company — the one who wasn’t invited to strategy meetings? By the time work got to him, the decisions were set down to the smallest details and all he did was execute. He wasn’t designing. He was executing on someone else’s design.
Things You Need to Do Before Hiring a Designer
Mike Monteiro

Yes! Substitute “content strategist” for designer, and “content” for design, and it’s also true.