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.