>Saving pages as HTML is not ideal because a) you get an HTML file plus a folder, not very practical if you want to retrieve them later
MHTML exists. https://en.wikipedia.org/wiki/MHTML
MHTML exists. https://en.wikipedia.org/wiki/MHTML
Not only that but HTML/CSS/JavaScript has been a moving target over the last couple of decades, sometimes people need something with longevity.