There is a right and wrong way in Torah. [So even if there some valid approaches that does not mean that all approaches are valid. Some are simply false. And that is the reason the Gra signed the famous letter of excommunication --to show that idolatry is not in accord with Torah. [This is kind of hard to miss in the Ten Commandments.]
For example in Philosophy. You might have a few different approaches to Kant. But that does not mean any approach approach is right. Some are false.
There might be better ways of approaching Beethoven. Some better and some not so much so. But that doe not mean scratching on a blackboard is playing Beethoven.
