While we could chalk this up to the brilliance of a true original thinker, the actual reason behind it is the same reason most college freshman essays end up in double-spaced 18-point font. The original pulp story, The Unteleported Man, was about half the length of a novel, and, as was the practice at the time, Dick was asked to double the story's length for a paperback release. Unfortunately, between turning in the original story and publisher Ace Books' plea for seconds, Dick had decided that he was done writing pulp like The Unteleported Man. He had also just started experimenting with LSD, and turning to the old creed of "write what you know," he decided to shift focus from space opera to space ball-tripping.
We can assume the artist made that choice long before him.
The draft was originally rejected by his publishers in a noble attempt to keep Dick from embarrassing himself. Then, in the '80s (the decade when everyone lost their sense of decency), Berkley Books acquired the rights to the original story and decided to squeeze the last bit of blood out of the then-dying sci-fi legend by releasing "The World Famous Classic Now Uncensored For The First Time," incoherent gaps and all, pretending that Ace Books had been stifling genius instead of protecting the reputation of a man who clearly couldn't handle his Class A drugs yet.