Again -- the fact that writing and subsequent inventions took place is such a short time really proves (yup, proves) that mankind isn't as old as evolutionists would have it.
But writing have nothing to do with Evolution.
Writing is a learned skill.
Writing is not a skill that you can pass biologically pass on in DNA, from ancestors to descendants. DNA only carry genetic information of organism’s physical or biological trait.
You are comparing two very different things - the abilities of writing are not biological, hence cannot be passed on genetically.
Writings do change over times or from location to location, but the changes don’t involve genetics.
Evolution - or evolutionary biology, like Genetic Drift, Genetic Hitchhiking, Gene Flow, Mutation or Natural Selection - is biology, and involved changes in biological traits been passed from ancestors to descendants, thereby being the cause of biodiversity in population.