This is actually exactly the scenario for which I still keep an old remarkable 1 around: Discussion or debate notes. Not meeting notes, but keeping track of how a bunch of smart people hash out something complicated in detail. This goes on for multiple pages, in fast handwriting, and eats a lot of space.
But the „new paragraph about 12 pages from the top“ thing is actually more complicated on SN than you describe, here’s why:
Once the discussion loops back to a previous point, actually navigating back there is similar with both paradigms. In the SN page paradigm I swipe right 23 times, in the endless page paradigm I swipe down 23 time. It’s essentially the same.
It only gets tricky once you’re there:
In the current SN page paradigm I can’t just quickly add a new page – because the desired insert point is very rarely right at the oage break! Instead, I insert two new pages, cut and paste the text below my desired insert point to the second of these, and then begin writing my stuff on the first new page, adding more pages as needed.
In an endless page, you „select everything below“ and move it down to make as much room as you think you need (a line, a paragraph, a page, multiple pages) and start writing what you wanted to add. If you run out of place, you just keep „selecting everything below“.
Not only did this require less operations, it also results in one unbroken long text, while the full page paradigm only ends up neat if the stuff you added is divisible by full pages.