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Designer here. I went all in on the Golden Ratio for a season. It was good for some things, bad for others—kind of like everything else. I never thought about it with regards to type sizing so I may try that. That said, it will utterly ruin some things.
Values are dependent upon hierarchy because values have to and enforced. The attempted removal of hierarchy minimizes and/or obscures the company's values and prevents them from being lauded. In its nature, the flat model is not forthright to its workers. This is why its employees function with suspicion in the dark.
Fear of change and new things. People were opposed to cars when they were first introduced. Ironically self-driving cars will arguably save countless lives. The resistance and fear will pass. But I do love driving...
This was really helpful to see how the author thought through the palette's creation. In my experience, I came to similar results, but over a long period of time and rather haphazardly after endless tweaking.
I would add that often times it's helpful to define a "light on dark bg palette" and "dark on light bg palette."