Interesting. The FAQ on state.gov still says you can request a "large" book. Though I realize the .gov websites might not be the most up to date at the moment. https://travel.state.gov/content/tra...help/faqs.html

13. How many blank visa pages do I need, and can I add pages to my passport book?

Some countries require that your passport has two to four blank visa or stamp pages. Some airlines will not allow you to board if this requirement is not met.

You cannot add visa pages to a current passport book. If you need more pages, you must renew your passport book.

On your passport form, select the option for a "large book" so you can get a passport book with extra visa pages.