I would love to see a return of a downloadable reference guide / user manual. I want the ability to read through it offline, occasionally print the page that's pertinent to my task, and have a book that is physically on my desk (not the desktop).. FYI, on this page (https://helpx.adobe.com/illustrator/faq.html), under Learning Illustrator > Where can I find the manual, the answer is: "You can find web and PDF versions of the Illustrator manual on the Illustrator Help page." I'm still looking for that PDF...