What is your opinion on it? For those of you that don't know, the universal rule basically states that if a demonstrative rational proof contradicts the apparent meaning of revelation, then the apparent meaning of revelation must be abandoned and reason must be given priority (so revelation takes on a metaphorical meaning).
If you wan't to learn more about this rule:
https://www.academia.edu/13279975/Al_Ghazālī_at_His_Most_Rationalist_The_Universal_Rule_for_Allegorically_Interpreting_Revelation_al_Qānūn_al_kullī_fī_l_taʾwīl_
What contradictions have you found in the quran?
The problem with allegorical thought is that it detracts from the greater narrative of the story. Take the story of adam (as) (submission) a commonly held belief in mystical christian thought is that the serpent in the garden bestowed knowledge. This is incorrect, and is from the lingering religious iconography of various polytheistic myths that were present in the area. People love their traditions and will do anything to hold on to them, the common discourse with prophets in the Quran al kareem when approaching their people was; “shall we abandon, the practices of our forefarthers?!”. A good question to ask, from this, is why? Why do people want to hold onto these beliefs? The answer is the will to have control over their destinies, even if this desire is only present on a subconscious level. To have control over your expression, surroundings and environment - now where do you go from this? Do you become a reductionist-materialist, a stoic, a pagan? Or do you conceit that you can never have any meaningful control, yet still strive and become a believer?