I noticed today that if I started out intending to send a file directly to my printer and chose to print on both sides of the page, that when I decided to opt for PDF printing, the pages would be printed out of page order to allow for manually flipping them in the printer.
The reason I switched to PDF was so the printer could automatically flip each page, an option not offered (or which I could not seem to wrangle) in the Dorico print dialog.
I went back to the printer dialog and turned off the duplex settings to have my PDF save in page order but thought this was an interesting observation others might wish to know.