A Big Little Idea Called Legibility (2010)

I love this: I think it may be really insightful in UI design. At the transition from user interface to user experience, the attitude gradually changed to a curated experience: perfect design, a specific way of doing things. We see this a lot with Apple, including how powerful features have disappeared.

I strongly suspect the root cause of their current UI situation on Mac could be tied to the theory in this post.