However, the default experience is a little box that says "Streaming is available in Safari and the WWDC app". Now I have to go out of my way to learn that they stream via HLS, obtain the stream's URL and feed it to VLC. †

Compare this with Microsoft's and Google's videos (available through Channel9 and YouTube, respectively) that are accessible "virtually" from every operating system and device.

If your goal is to attract new developers to the platform, maybe adopting a more widespread industry standard (such as DASH, which all other browsers implement) is probably the way to go, IMO.

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† By the way, the box also breaks the "Copy Video Location" menu item, so I have to open the inspector or install an extension to find out what the real URL is.