I swear nothing has gotten less intuitive than trying to sync content to an iPhone. WTF happened to just opening iTunes, clicking check boxes, then clicking "Sync"??
Now apparently I have to open Books, import my audiobook there, quit Books, open Finder, watch my phone disappear from the sidebar, try to airdrop the file instead, discover that just saves it to the drive but doesn't add it as a playable audiobook, and finally weep.
All I want is to hear about space marines killing aliens!