Use Cases and Deployment Scope
I use QuarkXPress for all my design needs, from developing graphics for social media posts, sales collateral materials, posters, white paper PDFs, book and publication design, and more. Its page layout functionality is second to none and it grows better every day in terms of its ability to manipulate photos, text, etc (ie taking on more of the basic tasks of PhotoShop, for example).
Other Software Used
Adobe PhotoShop, FileMaker Pro, PhantomBuster