You Heard me. Seriously, I have seen some so called low effective theories of gravity, so if they are any good why aren't they taken to be as established theories, since all other ones seem to be valid in some energy scale anyway. Although I do admit that I dislike this adding one more field on top of others to describe a new phenomenon while everything should be derived from some basic entity. As an example https://arxiv.org/pdf/hep-th/0211072.pdf P.S. I know of the graviton argument, but higgs was not discovered for many decades either.