Why there is any 'matter' left at all: why did not the 'normal' + antimatter do what these do when they meet ??? (Or, at least - oscillate in relative dominance!?)

(Always we love to 'get back to symmetry', as it just feels so Right. No?)

Physics (astro- or other) at its extremes - becomes indistinguishable from its meta- counterpart. And with astrophysics - there isn't even that "colloquy of argumentative minds" to assess "experimental results". (We are pretty bad at Nation building; fortunately for the Cosmos - we don't get to do terraforming. One hopes.)

Now, if we tweak that Gravitational Constant juuust a tad