As there have been several instances of what I call the “curmudgeon” symbol—and i’m sometimes the resident curmudgeon—I hate typewriter scrolling. 
Until I was into my 40s I had to use typewriters and produced many, many thousands of pages. For years I had dreamed of using a computer instead. Once that became possible, I want to be reminded of typewriters as little as possible.
One of the downsides of typewriters was that, because the sheet of paper currently used flopped downwards as it progressed though the roller, I could see only a few lines of my text at a time. Whenever I needed to scan the last few paragraphs I had to reach out and flip the page upwards or, worse, grab for the previously typed page.
IMHO typewriter scrolling on a computer introduces a similar problem, as no more than half of the available screen space is available for quickly scanning previously entered text. I would find that irritating and concentration-breaking.
As to the issue of concentration, my dogs could testify that when I’m working they have to go to extreme measures to get my attention, as at feeding time. Surely, there must be other ways to achieve focus than seeing only half the screen space for text entry. 
Yes, perhaps typewriter scrolling could be made a Preferences setting. But DEVONthink already has a large number of Preferences settings, and the developers try to keep the range of options from becoming confusing.
May I suggest another approach? Although I haven’t looked for one, there must be free text editors that use typewriter scrolling. Install one, set it in the Finder as the “parent” application for plain or rich text, and then you can open the document to be edited under that application. Your text will then be entered at the vertical middle of the screen.
Example: I use rich text for notes and drafts. But as I sometimes need to send a copy to others who don’t use Macs, I’ve set the “parent” of rich text as Bean. I can then press Shift-Command-O to open a rich text note under Bean, add a header and footer and then print as PDF, so that a Windows user can see my paginated note or draft including text formatting, links, images, tables, numbered pages, etc. I didn’t have to wait for the DEVONthink developers to add pagination, header and page numbers to Apple’s rich text code.
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