The truth of the matter is that a lot of PKD and Heinlien era sci-fi was very focused on exploring a single theme - that works well literary but isn’t rich enough for TV/Movie - so those works generally got richer and usually were by transitioned by genuine fans that tried to keep the theme and core message.
I feel this is mostly the case with short stories (and a lot of those works were short stories). Where there isn’t enough material for a full movie, the writers are free to add more to the story without messing much with the original. DADOES did have enough material but the movie decided to go a different direction while keeping the main theme. I wouldn’t say one is better than the other in this case as they’re pretty different.
The truth of the matter is that a lot of PKD and Heinlien era sci-fi was very focused on exploring a single theme - that works well literary but isn’t rich enough for TV/Movie - so those works generally got richer and usually were by transitioned by genuine fans that tried to keep the theme and core message.
I feel this is mostly the case with short stories (and a lot of those works were short stories). Where there isn’t enough material for a full movie, the writers are free to add more to the story without messing much with the original. DADOES did have enough material but the movie decided to go a different direction while keeping the main theme. I wouldn’t say one is better than the other in this case as they’re pretty different.