Does General Relativity Fail at High Energy?

Curvature scalars are the best measure we've got of the strong field regime, which is what we ought to be thinking about. But some of them can vanish when other ones become very large. And so it's not totally clear why we should look at one and not others. I think that they're kind of interesting cases to keep in mind. They show that it's possible for some kind of divergent behavior to happen without curvature scalars seeing it. The way that people usually talk about singularities in general relativity is in terms of geodesic incompleteness.