Yeah, and one can ask if the universe even "knows" its own initial conditions. Just how much information can fit in one universe anyway? Why should it need an infinity of information just to function? Nothing else seems to.Right-- it's almost as though we feel that we need certainty, for some kind of reassurance, and so we project that need onto the universe. Why should it care if the future is certain, in the sense of being predictable from a present set of information? What if the future has in some sense already happened, yet there is never enough information in any present to determine it? Maybe the future just is. It could be just like the past-- many things have happened that have left no discernible trace, the events have been simply erased from the record by eons of deterioration. So if there is not enough information in the present to completely reconstruct the past, yet the past existed anyway, why can't the future be like that too?

There's no evidence that we could. At present, QM appears to do everything that can be done, except when that involves unification with general relativity-- and there's no immediate reason to think that making QM deterministic will allow that unification. Most experts seem to think it will require removing the determinism from general relativity. I cannot say why!
And how do we go about deciding what is the true nature of the universe if it is unimportant? Isn't the whole purpose of science to discern, out of the multitudinous complexity of all creation, what actually is important?