I really enjoyed the connection that the chapter made between the classic axiom of Less is More and the principles involved in social design. One reason I believe people find simple satisfying is because humans find comfort in the familiar. In high school, I remember my art history teacher explaining the phenomenon of pop art and how the masses could more readily understand and recieve that type of art due to it's root in everyday culture. I think something can be said for lowering the barrier of entry to any activity, which relates to the principle of universal design. Creating for most the basic shared ground can often be beneficial to all.
Going on to the principle of anonymity, however, I can see that being a double edged sword in terms of designing for the lowest common denominator. For some anonymity could be a positive force, but for others I can see that as drawing them into a negative spiral. How do we design when one element can lead to opposing reactions from different groups of strangers?
Relating to principle 7.12 that not everything is a worthwhile problem to be solved. I was instantly brought back to a memory of my freshman year advisor when reading this. In our engineering centric school, he was explaining how the way of thinking with architects and designers differed from the dominant mindset. I remember clearly him saying "we're not problem solvers but problem seekers." I think this principle is similar to that quote because artful design is more about questioning human understanding and figuring out what the right questions to ask are before diving into whether or not they need answers.