To be initiated into the corporate world otherwise it is not necessary. Most of the learning of my profession had nothing to do with my formal education.then why would anyone go to college.
Apparently you don't know too many engineers. They predominantly learn from tinkering and failures more than any other profession.Most people learn better from books (a harmless jab at engineers!)
Daniel explained how people learn. It is not the book that matters it is the written language that may or may not get passed on to the reader. Visual aids have always been used. In a book all you can illustrate is a still photo or a sketch. A book cannot compete with the internet that is capable of video illustration and sound when it comes to learning.