HN tends to be a place where many technical experts explain complicated things succinctly because they know the audience here has a certain baseline of knowledge. I scrolled down until I found this question (as I have the same "huh, what is this anyway?" reaction).

Because I'm a "Very Busy Person" and don't actually have all day to screw around with "every YouTube video", I come to HN to optimize my time spend/information gained ratio.

Likewise, on this topic, even the above is still confusing. People say it's more efficient, then replies say we're already at 95-99% efficiency so it doesn't matter much. I'm still fairly confused!