Booking Through Thursday -- What is Reading, Fundamentally
IMHO -- reading is feasting your eyes upon the written word and ingesting the meaning therein. I think all of the examples, except audiobooks, constitute reading. There are many types of reading, for example, reading for pleasure, reading to gain information or instruction, required reading as in a classroom, necessary reading as in street signs but for it to be "reading" it has to include the visual action of looking at the written word.
I think that "reading" changes with different stages in our lives. As a child, reading comic books for instance is reading as much as reading textbooks. As an adult, one may read for his/her job or education. People read novels and literature for pleasure. It is still all reading and all beneficial.
I think that reading is the single most important skill a person can acquire. If a person can read, he/she can accomplish anything.
Did I actually answer the question?