If inflationary cosmology is correct, then the observable universe was the size of a softball or a basketball or something of that order at the time inflation ended (~10^-32 seconds after the big bang). And all the mass of the observable universe was inside that little sphere.
Which means that the mass was inside the Schwarzchild Radius for that amount of mass. Which means that the observable universe should have been a black hole.
So: Was the observable universe a black hole? If not, why not? (ELI20 or so, please, if possible.)
If it was a black hole, is it still? If not, how did we go from "was a black hole" to "is not a black hole", and when did we do so?
If it is still a black hole, then... what? What are the consequences of that?
