But that article is exactly what we want on the internet. It's the kind of interactive teaching demonstrations that forward looking educators have been thinking about for decades. It's not bloated or overdone; it doesn't take up significantly more processing power; it works far better than a traditional article ever could. This is what we desire the internet to be like.
It's because of articles like this one, or 3Blue1Brown videos, that I feel like the idea of "the document web" is really a step backwards: the internet is not just a glorified transmission method for paper anymore. We have computers, which are able to do so much more than paper ever could. To not exploit them for their capabilities, simply due to fear of exploitation, is far worse. How much worse do you think https://thebookofshaders.com/ would be to learn from if it couldn't include live editable demnostrations? To divide up the web into "interactive" and "non-interactive" content is to remove the ability for creators such as the author of the Mechanical Watch article to add progressive interactivity to their documents, remove the ability for learning resources to fully utilize the power of computers, to remove the ability for small fun things to be added to sites such as a Konami Code easter egg or https://bruno-simon.com/'s interactive website. And before you reply with something like "these would all go on the interactive web", my point is that dividing the web like this would not only be pointless but would also be ultimately harmful to the creation of things such as these.