Cannot follow your comment. Junk as noun refers to rubbish/garbage and therefore means something to be worthless. Parent comment says that it isn't worthless. My questions are:

Are you saying this is wrong and so-called junk DNA is indeed worthless?

Why you say to disregard ENCODE claims and are the functions mentioned in parent even related to them?

Can you make a synopsis of what the book you're recommending talks about?

Also note the book predates ENCODE project results and being 15 year old it doesn't consider any newer developments either.