When I watch Gattaca, to support my suspension of disbelief, I choose to retcon the sequencer technology a bit. On the presumption that 99.9% of the people usi

When I watch Gattaca, to support my suspension of disbelief, I choose to retcon the sequencer technology a bit. On the presumption that 99.9% of the people using the system are never going to act on information disclosed by the system in a manner that would not involve returning to the established system as a middleman, it simply cheats. Random samples of DNA are tested and sequenced, and a machine learning system leans heavily on databases of stored information to extrapolate findings that might be of interest to the customer. Most people of Gattaca don't have a deep understanding of genetics. They just know what the computers tell them. As such, pretending to be another person with donated biological samples is the low-budget option for evading the system. Those with enough power and resources pay to hack the system itself, such that the ubiquitous sequencers report more favorable results than they otherwise would. This also means that a lot of the parents buying designer babies were getting placebo. If there was no obvious congenital defect, the docs just left the natural genome alone, and simply told the parents it was the best baby they could possibly have, while marking the genetic samples kept for reference as "valid". Yeah, that's right, I made the dystopia even worse in my own imagination. Not only is the society stratified by money, the foundation is 99% fraud.