The Quran is used to guide people through real-life events. Why did that process stop, especially when today’s world needs guidance just as much? Especially since Imam Mahdi is in occultation, how are we meant to receive guidance today?
This is a big question and one that many people may have different answers on.
In my view, we have to have faith that we received what is necessary for us via the Qur'an and hadith, and ethical principles stated in them, and that we are meant to put forward effort to try to deduce the right answers for our time. This is part of our test and struggle as individuals and as a human race.
We still receive spiritual guidance from Imam Mahdi (A) and of course from Allah, even if it is not in the form of texts.