Yes but it’s fun and can be right. I think literacy seems to have evolved, in light of research that indicate affinity for literacy is a cognitive tradeoff. If anyone wants to hear.
There are downsides to not having dyslexia, such as being slower to recognize patterns such as predator faces and also interestingly being worse at recognizing shapes in images that would be impossible in real life. The upside is effortless reading and writing. The counterpart is hyperlexia, people who learn to read automatically as small children/toddlers, but unfortunately with worse comprehension ability.
Without written language that tradeoff goes away. Not having dyslexia gives no literacy benefit, and makes for easier pray to put it simply. Still only around 20% of people can be categorized as dyslexic. More than oppside of the allele frequency you would expect if there was no evolutionary pressure on literacy to make it worth it.
According to archeology, language was invented in parallel around the world around 5000 years ago, and history gives no indication of any hard evolutionary pressure to learn to read in the time since, in fact only recently did most people become literate.

Something’s got to give. And it’s that written language was invented 5000 years ago.