New matter being created with extremely low probability fits perfectly with our observations.

I do also want to point out that stuff like "The conservation of energy" law, in other words, that energy cannot be created or destroyed, does not hold for our universe with our current models. An expanding universe violates the time-translation symmetry

This is our current models. This is what our current physics says. And we know it's incomplete.

When it comes to scientific predictions, you always, always, need the caveat, "under our current model of".

That’s something I’ll never be able to understand. Something having no beginning. Just like I’ll never be able to understand a moment before the big bang, or at the moment of the singularity, where time did could not exist. If there’s no time, how can anything, like the big bang, happen? Unfortunately the singularity is something we know nothing about whatsoever, and probably will never know.