Could God have not created? If so, then creation is contingent and not necessary.
It seems as if creation must be necessary, however…
Would God have chosen a less perfect approach (i.e., the approach of deferring to create)? No, since it was less perfect.
…and this is exactly the reason. For you see, a being of pure actuality has a number of necessary traits as a result of completion in being, one of that being that you are ultimately and eternally in a perfect state due to your very own completion and not due to any externality. As such, God by himself is already maximally perfect, we may agree out of necessity.
Now, if we claim that the universe is unnecessary, then its creation was voluntary, but were it voluntary we may conceive of a world in which the act did occur and did not occur. If we do this, we would have two different effects stemming from the same cause. Now, I think we both agree that if a cause is the same but the effect is different we can find the explanation for such through either one of three things:
a) The cause changed in quality, thus explaining the change in effect
b) The surrounding conditions changed in quality, thus explaining the change in effect
c) The principle of sufficient reason is wrong, and thus the effect was merely random
Now, the first one cannot be the case, for God’s essence is pure actuality, to which fully explains his existence of pure actuality. Because of that, to conceive of a universe where God is different in quality (even if voluntarily being in that quality state) to make way for a different effect requires we imagine God as having an altered existence (even if slightly). But that would only happen if his essence is different as well, but the essence of God, like all essence, must always remain constant across all conceptions in order to accurately be a description of an entity (for what makes a man in this universe must be what makes a man in all universes). As such, the essence of God must be different, to which it cannot be. As such, the reason for difference in effect cannot be found in God.
The second cannot be the explanation either, for nothing can hinder the absolute will and plan and intentions of God except for what is definitionally impossible. Further, because the all entities are ontologically subsequent to God, there can be no “surrounding conditions” which are there to change the outcome of the results.
That leads to the final explantion, which has been proposed in an attempt to fix modal collapse by apologist Christopher Tomaszewski, to which is also unsatisfactory, for it does not remedy the problem presented which is the absolute inability for a pure act entity to choose whether or not to create a universe. Instead its a philosophical slight of hand, taking the presented problem and masquerading it as a problem of result rather than cause.