Please, don't get me wrong, the beauty of Affinity is to put a professional and individual workflows into hands of content experts as we are, not only traditional graphic designers or publishers. Like iBooks Author does.
I completely agree that Books are not dead (even keep "yet' for myself) and have their place, however, we have so much more now to share information, growing information, for complex learning and teaching processes. We need to involve new options and Affinity is maybe one of the little companies to make that possible.
Have a look if you'd like to see what I'm talking about our Dutch iBooks Library of Medicine (108 iBooks, 10 clinical specialties, 1200+ medical conditions) https://vimeo.com/225697805
For download of iBooks - all are free http://mlx.amsterdam/library
Last question to challenge you
I don't use streetmaps anymore, do you?