I am just someone on the Internet, same as you. My expertise can be whatever I tell you, and is as important as whatever you want to claim as you expertise. Which is to say, it's not important at all. I could be lying and so could you. Doesn't mean we cant discuss things

But I'm pretty sure written language is a huge milestone in cultural development that most professionals would agree with. It is a huge advancement in almost all areas of civilization like the medicinal, cultural and technological fields. Hell, it literally changed our brains.

So the question is more, do you believe humanity was actually better before we made that giant leap? Because creating a written language fits perfectly into the definition of development.

My guess is that it'd be an extremely rare case that a culture was "better" before it came up with a written language. They just didn't have to capability of destruction that 8 billion people to.