People like visual sense, this graphic usually makes the marquee stand out rather than the words statement around it.
Words reading is a good way to learn things more clearer, but graphic can give people more easier and helpful overview. Graphic can provide summary or assist
When you have a good design, site map uses as a planning tool in web design for a visual structure of a website. when we try to experiment and organize a system, site map can help you get started fast, and connect elements together.
Flowchart can help understand process and structures of work, so designers can find out best & issues implicit in the work. A vision helps describe what the work process will be and how it goes.
When i do site map, and my question is that what site map works for. i found the Apple Site Map, https://www.apple.com/sitemap/,
and compared to the normal Apple website, i have to say i like the normal website better. Site map and Flowchart are good for design process communicating a design, but not for customers.