@thehen.
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On the Richly Textured vs. Visual Clutter: (This is a personal opinion as these are not academic but subjective terms) Richly textured designs are those that use layers of elements and many elements that oppose minimalism or extreme whitespace. Visual clutter is a result of poor organization of elements in a design that distract, confuse or frustrate the viewer either physiologically or psychologically. Richly textured designs can give warmth, create mood, and enrich an experience, clutter just messes it up.
Many elements != Clutter
Clutter = Lack of structure, organization and relationships
Richly Textured opposes minimalism and starkness
Richly textured doesn't necessarily need to have tonnes of elements but depth, tone, and relationships between elements both subtle and strong.
Some minimalist designs are visually cluttered.
Again these are opinions of someone who is a student not a professor of design (student as someone with a library card and an Amazon account and has spend time learning from others and doesn't consider himself a graphic designer by any stretch of the imagination).