The universe supposedly has millions of galaxies and billions of planets. Why would god go through all that trouble
creating all of it? For what purpose does the universe serve?
Was god just bored and decided to make a very detailed Minecraft simulator?
"I think I will put a cute little ring around this planet........"
The complexities of why we are here, were never meant for humans to understand. We might just be the byproduct of an elemental soup.
I guess the first assumption is that God's creative efforts were difficult or troublesome for him. Scripture indicates that as far as our existence is concerned he simply "spoke and it came to be".
Scripture indicates that the "heavens declare the glory of God". I think his creation also illustrates the vastness between his infinitude and our finitude. In other words, it helps us better understand who we are subject to and what he's capable of......respect might be a consideration.

I think the complexities of why we are here are incredible, but more than the complexities themselves is the improbability of those complexities arising on their own - that's far more unfathomable to me.
Further still, it's hard for me to buy into the random exploding of nothing into something (via no trigger) and then further explosions of the smaller somethings (ex: stars) and their swirling remains slowly coalescing from a state of chaos into order and then slowly evolving from one type of thing to an entirely different thing with no source of control....ultimately only time as the agent of change. That's a tall order to swallow for me, but that's me. I couple that with the special revelation of God's goodness, grace, mercy and love in my life and I'm hard pressed to eliminate a universal singularity (aka God).