You don't need to have life figured out before you have kids in the same sense you don't have to fix your car when the check engine light is on, or you don't have to replace a rusted water boiler. You won't immediately die from it. You can do it for years without issue if you're lucky, and many people do exactly that. But if you're in a position you can sort things out properly without financial strain, everyone will tell you to sort this out ASAP and you're stupid if you don't.

The problem is that it's literally impossible for most people to have life figured out before hitting 25, and very hard before 30. Importantly, that wasn't the case just one generation ago.