I think it will work a bit like wireless headphones with audio passthrough. I can sit at my PC and hear audio from whatever I'm doing, but I can also get up and move around and still hear that audio. The audio passthrough, even though it's not perfect, is easily good enough for me to hear my environment and even carry on a conversation without having to take them off, and I can pause whatever music or podcast or video I'm listening to just by pressing a button on the side.
I think the headset will provide a similar experience in that you can push whatever random YouTube video you were watching out of your direct line of sight, and then get up and go make yourself lunch while you're still half paying attention to it. Not only that, but you can interact with it using your eyes + minimal hand gestures.
The really intense, fully-present experiences (like gaming on a current headset) will probably still happen, but I think most people won't be spending much of their time there, similar to how the total amount of time spent in modern, intense, realistic gaming is tiny compared to how much time people spend scrolling feeds and mindlessly consuming content.