Over the years of being a student or of being a teacher, it's occurred to me that I've never done every topic in a textbook. If it's a workbook that has a few introductory theory pages and then a few more pages devoted to working on practice problems and has blank space for students to write in, then yes, I've completely covered everything in those books (both as a student, and in assigning it as a teacher). But I've never had such thoroughness when it comes to a textbook.
I'm not asking if you should try and cover everything, but I'm just wondering if any textbooks are have been completely utilized? If so, then which ones and what about them made it so that you could (or would) cover all topics?)
(About level of textbook, I'm referring to post-secondary/high school (so I'm referring to college or university texts))