Sure, but when do you propose someone pick their own name? What are they referred to before that point? I know there have been cultures where what you are suggesting is exactly how they handle it, but in societies that have identification numbers and birth records, they need to be called something before they are able to choose their own name.

Like, the actual, physical logistics of what you propose doesn't make sense to me. Normalizing changing your own name to something you choose later, though, does make sense.