The pitch deck is more than just a gorgeous design. It is in PowerPoint format (usually) and one of the many assets that Sales needs to introduce customers to your company, its products, solutions and benefits. (Or perhaps it is needed to attract investors but that requires different information - this blog is for Sales.)
In our experience, the pitch deck is often created by Sales, doesn’t follow best practices for messaging and doesn’t align to the company branding. When the pitch deck is created by Marketing, Sales often feels it’s less relevant, or needs to be customized in some way and then it ends up looking unstructured and unprofessional.