I still think it should be offered as a preference to people. Pages and content requiring high cognitive load is difficult for a lot of people, so packing information too densely can feel overwhelming, making people lose their place as they're browsing through content.

It's the same reason we have paragraphs in writing, rather than walls of text. We need tools that help us spatially recognize + remember content so we have a relative frame of reference to quickly get back to something we're looking for.

It's the same reason we have pages in a book -- not just that it's easier to carry a book versus a long scroll of paper, but it's objectively easier for our minds to handle the limited amount of content each page provides, as we get ready to flip to the next. The amount of pages we've read in a book also give us a natural indication of progress.

In a similar way, UIs that are split up a little better give those of us who do get overwhelmed a better way to organize the content we're looking for. This is why the majority of web apps have distinct views dealing with different content and reachable utility dealing with that content.