As simple as possible to summarize the best way you can, first, please. Feel free to expand after, or just say whatever you want lol. Honest question.
It's a bigger leap to consider something came into existence from nothing. Your link explicitly explains it for you; "The zero point vacuum of space is proposed to be positive and infinite". Nothing is created from nothing in science (despite the alluring title of the article) especially not any laws of physics, space & time itself, nor extra dimensions or anything else. Laws of physics are fundamentally different from both matter and almost any ontological standpoint.
It is of course not neither easier OR as hard to consider the universe to have been created by a conscious entity or as you propose, just spontaneously. They are both infinitely complex and "philosophical" as you say "impossible to prove". They can be viewed as fundamentally the same metaphysical statement.
Because they are the same leap of logic. You argue in a circle against yourself when you say it is more complicated; if a being exist that created it, as something else creating it. As time starts, what started it? Nothing is required for it to have always existed. It is more elegant to me, but you may feel differently.
It is again the burden of proof of the creation theory and your theory of spontaneous creation that there is a before anything and what that nothingness is. We have no scientific proof of that, and zero dimensions thought experiments are not close to explaining or proving what that is. After that you have to paradoxically prove what any symbols used to describe that proof came from ad nauseum.
If you understand occams razor and even go so far as asking yourself "how can time exist for infinite time?" you need to at that point not instantly give up, refer to the fact I explained in the beginning, that we are beings of space and time that have a hard time grasping infinity. It does not mean it is impossible. It certainly does not mean we can't or shouldn't advance our understanding of physics.
The concept of nothing, the concept of infinity; yes in philosophy impossible to prove and easily landing the philosopher in mind traps. However in science, testing and providing an accurate framework for our environment is instrumental for philosophy. We often discuss, test and make thorough use of n-D systems, infinity, and many of the concepts you bring up without breaking our minds. You give the fantastic too much credit. We learn how to derive four dimensional proofs as kids. Ironically, zero dimensional problems are the easiest.
We are capable of proving physical properties of our world and use that to inform our philosophical choice. It's just that you choose religious philosophy (not to be confused with philosophy of religion) and I chose scientific realism to explore.