Why didn't English judges break their paragraphs?

Weren’t unbroken "pages of type" even more unreadable back then? If so, why didn’t judges break their paragraphs with one blank line? At least in 2018 (year of publication of book below), paper and print quality is higher…no ink streaks or smudges.

      The final point has to do with the visual layout of the paragraphs
on the page. Most of you have read older decisions that seem to
be one long paragraph. Nothing is more daunting than facing an
unbroken
page of type, and few things are harder to read. You all
know that you should begin a new paragraph every time you begin
a new idea, but there are times when you may end up with one very
long paragraph. Even though the paragraph may be correct as a matter
of grammar, you should consider breaking it up into two or more
paragraphs as a matter of style and thus increasing the amount of
white space on the page. Doing so will undoubtedly increase your
reader’s understanding of your discussion and thereby increase the
possibility of your receiving a higher mark.

Stacie Strong. BA English literature (UC Davis 1986), MPW (USC 1990), JD (Duke 1994), PhD Law (Cambridge 2002), DPhil (Oxford 2003). How to Write Law Essays & Exams 5th Edition (2018). p 163.