“The problem: Having all the mass of the universe collapsed to a point would be the mother of all black holes; nothing would ever bang its way out of that.”
The Big Bang is short hand for Big Expansion of Space and it is not an explosion but a huge increase in the dimensions of space, and by the way, time.
If you measured space, any space, a billion years ago and did so again today for the same amount of space they would measure differently. And the Expansion is acceleratiing for reasons that are not at all clear.