TL;DR: I'm sorry but what you are proposing doesn't look to be helpful to solve / reduce the "problem" depicted in the video / about the FAQ being too long, etc. Actually, the concept is already applied in multiple places around the site.

<hr>

I took the screenshot that you posted in Meta SE and added a red hand drawn circle

[![enter image description here][1]][1]


Besides the issues already mentioned in the comments, it looks that you missed that already is a banner that is shown to anonymous users:

[![enter image description here][2]][2]

This banner has the text

> Super User is a question and answer site for computer enthusiasts and power users.

The above text is also in the site Tour, the `/help/on-topic` among other places.

# Related

- https://meta.stackexchange.com/q/387485/289691
- https://meta.stackexchange.com/q/301363/289691
- https://meta.stackexchange.com/q/387354/289691


  [1]: https://i.sstatic.net/trIxI.png
  [2]: https://i.sstatic.net/WyYJS.png