I find a lot of value in the summarization. Frankly, I'd rather read the notes on a 38 minute video and maybe watch the original source, rather than have to watch 38 minutes without knowing what the value will be.

Aggregation and filtering is value, too. Like HN, it's a channel with the expectation of a certain type of content. I can't possibly discover good tech talks (or any other content) entirely on my own.