There was no "before" the beginning of our universe, because once upon a time there was no time.
Once upon a time when there was no time.
There is no reason that the universe should be designed for our convenience.
We can predict the present without having to know everything about the past.
If all the stars and galaxies in the universe today were smoothed out into a uniform sea of atoms, there would only be about one atom in every cubic meter of space.
When we try to observe things that are very small, the act of observation itself will significantly disturb the state we are seeking to measure.