Earlier quoted context omitted.
> Look at a site like YouTube today. And yet any media player beats it at its core functionality: video playback. Often I find myself using youtube-dl to fetch a youtube video and just play it in a regular media player because it just works better than what browsers have to offer. There even are addons to export YT playlists to VLC and stream them. pdfjs is great. but every 3rd scientific paper I read tends to be som…
I think media playback is only part of the core functionality. The other key piece is discoverability, and on that front, YouTube is far, far better than a native media player. It also benefits hugely from urls, which allow users to share what they've found. So, arguably, YouTube's success is more about what the web does well than about it's media playback -- it just has to be "good enough" on that front.
What about URLs mean that a native player can't use them?