The purpose of a site like HN is exactly to give quality 2nd or 3rd hand accounts, so I don't need to watch an hour long video to form an opinion on it. There are many, many orders of magnitude too much 1st hand knowledge in the world for anyone to comb through. If you want to be informed on a broad range of topics, the only chance is to go by reporting that you trust, and for a great many people, that includes comments on HN.
If you have a contrary read of the video, it would be better to share it rather than lamenting that the thousands reading this thread don't each spend time watching it in person.