I think the six-principles approach is great, and it really shows why the initial reaction will always be contemptuous and therefore doesn't mean anything.
Of course, not everyone can easily copy the approach, you need to be an original thinker in order to not overlook overlooked problems.
I don't understand the last part of the essay about reddit as a classic example. "Tell people what was new", was that an overlooked problem? News agencies have been around for a long time. "Stay out of the way" was only possible because of the user-submission-and-voting system, which seems to me a clever and non-obvious idea. What I like most about this idea is the voting part, it tells me what's interesting, I don't care about whether it's new.