I think it's more that confidently moving forward without self-knowledge has more value than ineffectually trying to know yourself.

If there were an answer, it might be worth finding, but as that project hasn't found anything promising, there's not much value to keeping on with it.

I think tvanantwerp's point wasn't that you shouldn't attempt to know yourself, but that you should try to do so in a way that doesn't ascribe labels arbitrarily, such as "morning person" or "evening person". Not all aspects of identity can fit into such boxes. Otherwise, there's quite a risk of reifying the label and thinking that everything the label describes must describe you too.