But that's the point; if the endpoint is subjective, all rules derived from it, even if you use an objective system for doing so, are necessarily subjective.

maybe as we gain a more accurate and useful model of reality morals will come out of the"woodwork" like writing allowed us to begin pontification on them across generations.

Maybe it has already happened and we were unable to identify it. How would we distinguish it from all the other theories of rational ethics that come up from time to time?