If we are talking about non-technical people simply making documents for the web, I don’t think they ever really need to know what the DOM, dev tools, or state is. They’ll never really run into that, as the sites will be rather trivial, and that’s ok.
For someone looking to be a web developer, I can see where some would need a faster ramp up to hold their interest, but they should also still know that it can be this simple. I saw a video not long ago where someone asked a bunch of people who just finished a web dev bootcamp to make a basic HTML file and put it on the web, much like what this tutorial does in the first couple steps. Most of them couldn’t do it. If someone can make a page using React, but can’t make a simple HTML page, I think that’s a problem. It leads to a lot of overly complex solutions, because they were never taught how simple it can really be.
Even for technical folks, their area of expertise may fall outside of the web, but they still want a web page to share information. The basics are perfect and often used. Dennis Ritchie’s page was a perfect example of that. A lot of people from this era have similar sites.
https://www.bell-labs.com/usr/dmr/www/