It's not that, it's "too long with low information density so ingest it more efficiently." That way we can spend our time on things that are more productive or enjoyable.
There's more to learning than just information density. There's visuals, presentations, explanations. And if you want more proof, then a video played a 2x speed is twice the information density, yet we all know that many videos would be extremely hard to retain anything from at that speed.
As for the good videos, I can't watch them all. If I can skim a good summary, I can decide whether, for me, this video is worth watching, or ignoring, or just reading the summary more carefully.
That seems like an arms race, how do you know there aren't more productive ways to enjoy your time? Can something less productive be more enjoyable?