But, equally, theoretical physicists don’t work with laboratory equipment, taking measurements, they work with ideas and concepts. The internal coherence of concepts about the world is just as much a concern for scientists as for philosophers.This is such a terrible example. Because information is such an abstract concept, we don't know if it is destroyed in a black hole or anywhere else.
A current example is the black-hole information paradox, where the paradox is that current models of black holes suggest that “information” (which itself is a highly abstract concept, not a direct observable) is destroyed when material falls into a black hole. And yet, a basic principle of quantum mechanics (the best theory of matter, thought to apply everywhere) says that information can never be destroyed. Trying to resolve the inconsistency is currently exercising many of the world’s top theoretical physicists, partly because the solution might point the way to a model of “quantum gravity”, the long-sought unification of quantum mechanics with general relativity. Yet this activity is entirely conceptual, since observations and experiments pertaining directly to the issue are way beyond current capabilities. Physicists still regard the enquiry as “scientific”, even if some philosophers might want to declare it to be “metaphysics”.
Also, conserving information is not described as a basic principle of quantum mechanics in any textbook I have.
And there is no possibility that resolving this supposed paradox will ever have anything to do with quantum gravity.