Hypothetical Thought Experiment Involving The Nature Of Intelligence, Flynn Effect

One of my skippable posts, unless you happen to be interested in behavioural genetics or cognitive psychology. Ideas are important but I've not done as great job of clearly describing them in detail as my other posts, as you might guess looking at the length of the post. So taking into account the opportunity cost of the time spent and the expected utility or benefits from the ideas and their applicability to your life, you have to make the decision whether or not you have other more important commitments and projects, and if ideas related to relatively obscure academic topics and abstract thought experiments are going to be any use to you in your real life; not necessarily implying they're not, just saying that you have to decide for yourself, because thought experiments are about events or situations that have a non-zero probability of taking place in the real-world. Also to make it easier for most of you, if you don't wish to think too deeply and go by some heuristic, then I'd like to point out that the post is too short, taking less time than an average person would take to read it all, so if you're unsure then read it, unlike other skippable and less important posts where I just tell readers to not waste their time and not read it, when unsure. As always, open to receiving any comments you'd like to share.

Hello everyone. I hope you are doing well. I had this interesting idea for an experiment that occurred to me while reading a book about Genetics and Cognitive Psychology. Please correct me if I'm wrong or seem to have a poor grasp of the concepts, I'd like to be corrected and learn more in such a case.

Genes depend on the environment, and maximize for the traits required by the organism to survive and pass on their genes to their offspring who can then continue the same process, all in the same environment. So the traits that the genes try to maximize for are the traits that would also make it likely for the organism survive.

So what if we are able to grow organisms in a controlled environment, basically just like the artificial selection experiments we've been doing with non-human animals and plans, but the environment requires the organism to have, say, high intelligence, emotional resilience, photographic memory, superior spatial skills, resistance to pain, or creativity, to give a few examples?

If the necessity of these traits is slowly increase such that some organisms are able to survive and reproduce, then would their offspring have a greater likelihood to develop these traits? If so, could we then try to understand how such traits arise in life and how we can use them to treat mental disorders and maybe even manipulate or enhance traits that we desire?

Maybe this is unrelated, but could the Flynn effect be related to such a phenomena, kind of like a natural experiment that happened to some generations? It could be due to increasing literacy rates, but then the increasing literacy rates could in turn be required for better functioning in a society where intellect is more valuable than the traits that were required in the previous generations?

I was wondering if the Flynn effect could be a product of such an experiment in natural settings, like a natural experiment that happened to some generations. It could be due to increasing literacy rates, but then the increasing literacy rates could in turn be required for better functioning in a society where intellect is more valuable than the traits that were required in the previous generations?

Someone commented that the fact that people with low intelligence are not able to reproduce is evidence that this is not true, but then I had more questions that I thought could help me out with: The fact that people with low intelligence are not failing to reproduce does look like evidence that the Flynn effect is not due to natural selection, but:

If the changes really were due to environmental factors, can't we pin down those factors? Because if I'm not mistaken then intelligence is not a useless trait in today's world by any means, and it would help to investigate and know all the factors influencing it during development, also to treat individuals with cognitive deficits,

Are there any hidden downsides of the environment that resulted in the Flynn effect? Like, we all knows about the Flynn effect, which was an increase in a trait that is currently useful and in most cultures a desirable one, but were there any hidden undesirable traits or other downsides in the same people, something different from other generations, something that must have been traded off for greater intelligence that we may have overlooked?

What is intelligence? When we say that people with "low intelligence" are still reproducing at the same rates, and when we conduct such studies involving intelligence and other factors, what metric do we use? In case it's Intelligence Quotient, do you think it's a reliable and accurate indicator of natural ability or fluid intelligence?

Could it be possible that the people we consider to be low on intelligence may have a different sort of intelligence or ability in domains different from what we value in today's society, and are overlooking these abilities by judging them by our own societal standards and incomplete understanding of intelligence?

Could it also be possible that people with true intelligence, if there is any such thing, are actually quite successful in reproducing and passing down their own genes, and that we could learn more about intelligence by looking at people who are good at passing down their genes and somehow isolating the trait intelligence, with some sort of experiment like the one I proposed the post I mentioned and some statistical tools?

I'd greatly appreciate it if someone who knows about these topics could guide me in the right direction. Thank you.