Helping new users post better questions is... one of those things SE has been working on a while - and the review checks is a little less obvious to the end user than the question wizard.
One finds good questions come pre-reviewed. Folks spend a little extra time reading through and revising questions, ensuring that relevant information is available, hopefully in a usable form and so on.
The pre-posting review process just helps folks along here, and if you don't have any obvious issues, it's just an extra click. I guess it could pass you through if it passes, but I suspect being told your question is OK acts as positive reinforcement.
That said, there's always time to review - whether it's while writing a question, while posting or after posting, especially if it helps get a better outcome for solving your issue.