Vs. on YouTube, I probably can't get past the pre-content ad in 5 seconds.
Life is too short to waste any of it watching long-odds content on YouTube.
In contrast, if you click a YouTube link, it will almost certainly have audio that will play, and you have no idea whether you will open up something that is NSFW.
Also, for technical or involved topics, video is one the worst ways for me to take in information (the worst is lectures/presentations), so even when I can realistically watch videos linked from here, I tend not to. I just move on to the next story instead.
Another huge factor is that YouTube links are often provided without any explanatory text, so I have no way of knowing if the video covers something that I'm really interested in. Submitters can fix that problem, though, by including a blurb describing the video.
I like to post links to music videos in comments and even got some upvotes for
https://www.youtube.com/watch?v=VDFx8hJY5x8
But I hear from many people outside the U.S. that that video does not play for them (tell us if you can play it here!)
Also I think I can size up a text article to know if I want to read it in just a few seconds compared to a video that I may have to watch a few minutes of. Also I can read text articles in more situations (do what you want but I do not wear headphones for safety’s sake when I am out in the city or on the trail) but I can browse HN and most web sites rapid-fire on my tablet on the bus.