>or we need the existing models to propose a way it was initialized.
We have that, it's the big bang.
We have that, it's the big bang.
The argument being:
You can't propose physics ever changed, that'd mean energy could have been created at some point!
Energy was created at some point, wouldn't it be nice to know when?
Everything created at the Big Bang exactly as it is now, stop asking questions.
The difficulty is we don't know what happened in the first planck second after the big bang, let alone before the big bang (if that's meaningful).
We haven't unified quantum mechanics and relativity. Hence we can't be certain that singularities exist, or that the universe started off in a singularity.