Also implies that all singularities of the same mass are identical. I think this should be less bold of a statement. Let’s speculate that the more mass in the singularity would correspond to higher iterations in something like the Mandelbrot set. More of a resolution enhancement.
More if a scifi prompt than anything else to be fair.
Can you explain why you hope everything is deterministic?
But also it would be super trippy and interesting. Knowing just the mass of the universe you’d be able to peer into any time, past or present, and see exactly what happened. But then what happens around areas where people look into the local time? This happens in the show Devs. So not at all a new idea in scifi.