oh wow. CCR5 has been found to have a role in memory recently. Knockout mice have better learning[1] and pronounced increase in spine formation/turnover[2]. These babies are going to have super-memory:
Additionally, most cognitive traits come with tradeoffs, so increasing ability in one area may decrease it in another. For instance, some nootropics (modafinil) temporarily improve cognitive performance on complex tasks, at the expense of speed. I don't remember the specifics, but I've also read about similar tradeoffs regarding memory, where boosts in short-term memory may reduce the ability to form new long-term memories. The brain is pretty well-optimized on average, when you consider the unique properties and limitations of its constituent parts/materials.
Most mouse models don't replicate in other animals either.
https://www.mdmag.com/medical-news/breakthrough-discovery-in...
I agree, super memory is not necessarily a good thing
What if it makes people more scared, because they can remember past experiences better. This could lead to less procreation and thus inverse selection pressure.
Only because a trait is superficially good it doesn't mean nature would select for it.
There's a psychological phenomenon:
Additionally, nothing has to be selected (evolutionarily speaking). It's a stochastic process. We could be one base-pair swap away from perpetual youth, and never see it because it just doesn't happen (or when it did happen they died from other circumstances before reproducing sufficiently to spread the genes wide enough to be useful).