We know we live in a quantum universe, where matter and energy are expressed via distinct states called quanta. The question is why quanta in the first place?

The way I would answer this question is by first comparing a continuous universe to a quantum universe. A continuous universe would have an infinite number of states, even between any two quantum states. That means that a quantum universe simplifies the universe, relative to a continuous universe, due to fewer states.

This also means a quantum universe makes the universe more deterministic compared to a continuous universe. If we assume both are random, the quantum universe will load the dice, compared to a continuous universe, so only certain sides can ever come up. The hydrogen atom spectrum dice only has seven sides and not infinite sides. The dice are loaded compared to a continuous universe.

If you look in terms of creation, via random interactions, a quantum universe saves time, since a six sided dice will repeat itself much sooner than an infinite sided dice. In other words, if A has to happen before B can happen, and all we have is a random path toward A, A will appear much sooner in a quantum universe due to fewer options. In a continuous universe, infinite possible events or throws of the dice, might need to appear before A appears, thereby slowing down creation; wastes time.

A quantum universe allows more potential in time, for any stage of the universe, since it speeds up the process by lowering the number of options, thereby making the universe more deterministic, compared to a continuous style of universe.

As an analogy, say you are taking two different tests. In the first test, for each question there are 20 possible choices for an answer. In the second test there is only 2 answer choice per question. You can answer more questions for any given time with option two. You will finish quicker and/or have more time left over. This allows you to take test three, much sooner.