I won't write a full-blown blog post because the benefits don't surpass the costs in this world increasingly dominated by morons but I will mention that a nice paper
Quantum gravity has various general features, at least believed features, and they include the unitary evaporation of the black holes; and the absence of global symmetries. These features are supported by various arguments that are more or less rooted in AdS/CFT; more or less rooted in string theory; more or less rigorous; more or less universal. With a broad enough definition of quantum gravity, exceptions may exist in spacetimes of a low enough dimension.
These authors claim that the unitary resolution of the black hole information loss paradox implies that global symmetries don't exist. The former is almost a "self-evident consistency fact resulting from quantum mechanics itself" while the second is a "nontrivial dynamical swampland-like principle where one apparently needs the details of string theory". Nevertheless, the latter principle could follow from the former. They presented various arguments at various levels. A perhaps more speculative corollary conjectures that holography is equivalent to the existence of a Euclideanized treatment of quantum gravity.