Because you can create downloadable articles in HTML. They're packages.
Discussion
You can then read them offline or upload them someplace else and make them available online, in isolation of the client.
Some of my magazine subscriptions offer this. Read online or download.
You can also create a website with 30040/30041 notes, export it as HTML, and then display it under your domain.
There's something similar to this from the band devs, but this would be something you could host yourself, edit, and overwrite. So, more dynamic and personalized. You could auto-publish after you replace notes, for instance.
You know what I mean? Like, you could have a website consisting of NIP-62 events and just edit/add/delete the events, and the website would upate.