As an aside, why do DoT pdfs have such gigantic margins/padding around the text content?
It allows note taking and corrections on drafts. Same deal with things like SCOTUS opinions. (Random example: https://www.supremecourt.gov/opinions/25pdf/24-624_b07d.pdf )
I don't think that that's quite right. SCOTUS opinions do indeed use a narrow text size (4 1/8" by 7 1/8" [0]), but that's because they're designed to be printed on unusually narrow paper (6 1/8" by 9 1/4" [0]), not to leave room for taking notes. This paper size actually only leaves 1" margins on either side, which leaves less room for taking notes than most other documents.
[0]: https://www.supremecourt.gov/filingandrules/2023RulesoftheCo...