Youtube is amazing, it starts playing the video before even the video title is rendered or any other part of the page is loaded. Who cares if it downloads who knows how many megabytes of JS or HTML before the DOM is ready?
On the other hand, after clicking on a tweet link Twitter would show me multiple loading indicator, load the main page then show me some more loading indicator and then show me the tweet text and after a while, I can see the images attached to the tweet. It is often the same for any other "Web App".
On Apple's case, the page actually becomes usable almost instantly. The page would first show me the title on the black background and then the airpods photo would fade in from the darkness and I would be able to scroll immediately. I would say, the experience is closer to Youtube than Twitter.