You can define the moment when the universe stopped being a singularity as t=0 and its "end state" at t=1, without knowing what that end state is, and still mak

You can define the moment when the universe stopped being a singularity as t=0 and its "end state" at t=1, without knowing what that end state is, and still make general observations about the beginning, middle, and end of the universe. Of course, you can't derive any specifics about specific regions of spacetime when thinking this way.