Mmm .. but our intuition says that this is not so.
Our "intuition" also said that time is a constant everywhere at all times for everybody. Relativity tells us this is not so.
Our "intuition" is like our "common sense". It can only keep into account those things that lie within our field of day-to-day experience. ie, medium sized objects of medium sized mass traveling at medium sized speeds affected by medium gravity.
The quantum world does not lie within that field of experience. So just about everything we learn(ed) in that field, flew right in the face of our "intuition".
So much so even that Einstein actually was pretty much convinced that he had to be in error somewhere, because his "intuition" informed him that all the "spooky" stuff that was predicted by his theories, like black holes and quantum physics, sounded like nonsense.
The lesson here is that whenever it comes to the frontiers of scientific knowledge, our "intuition" and "common sense" is utterly worthless to arrive at accurate answers.
So, in context of our "intuition", the actual explanation of the origins of the universe (no space, no time, no physics) is
bound to be mega bizarre to us.
In essence, once again here you seem to be guilty of an argument from incredulity.
The fact of the matter is that everything we currently know about physics, like relativity, informs us that Time is an inherent part
of the universe. Meaning that it doesn't exist if the universe doesn't exist.
Meaning in turn that the concept of "before" the universe, likely doesn't make any sense.
It makes little sense to say that it is impossible for something to exist outside of the universe.
Perhaps, perhaps not.
We don't know.
But once again: you don't know what does and doesn't make sense in advance.
Black holes didn't make sense to Einstein. That's why he assumed he had to be in error. But he wasn't.
You don't know what is and isn't sensible in advance.
We cannot therefore make such an assumption that time, itself, is merely a property of this universe.
It's not an assumption. Relativity is not an assumption. It's a well tested, well established, scientific theory.
Are you saying that the theory is incorrect?