I'm going to discount the following possibilities:
A/ The research you think was omitted from or bastardised by the film may have not existed or been readily available to a screenwriter at the time
B/ Not every story adding a scientific undercurrent to its main plot is written under the tutoring of real scientists
From what I gather, you're coming at it from the perspective of a professional scientist, or maybe that of an amateur scientist. And it is understandable that you would want "good" stories to also feature "good" science. But it is a flawed position that is not tenable in the context of fiction - because every work of fiction is the fruit of its author's whims and intention(s). Works of fiction always depict a "story world" that is more or less consistent with the real world but no matter how accurate they are on the surface, these worlds only ever answer to the rules dictated by the storyteller, and not by those that govern the real world.
You can say that Blade Runner is unscientific, but you cannot fault the movie for being so, when you have failed to prove that the filmmakers had any intention to deliver a movie that was scientifically accurate.
Basically, your position is unscientific: You're starting from an assumption born out of wishful thinking ("I wish they hadn't...") and criticise the facts for not adhering to that assumption. If you start from the facts, there is nothing in Blade Runner that tells me that the film ought to be scientifically accurate. Its representation of 2016 Los Angeles is not factual, its characters are not factual, its premise is not factual, its vehicles are not factual. Why should its science be factual?
So I must reiterate: Blade Runner is not about Earth science or science in general, and it is not a scientific movie or a movie trying to depict, teach or criticise scientific truths. Therefore, while you're free to dislike it for what it is, it is unreasonable to isolate its representation of science as non factual when nothing else in the film adheres to a factual representation of our world.