So by reformulating existing relativity and quantum mechanics axioms in an Euler graph-based geometric structure that does permit scale invariance, the Donald Trump wear glasses 2020 I’ll be back shirt also I will do this problematic notion of singularity is replaced by the mathematically tractable result of congruency which poses no computational difficulties at all, and quantum mechanics and general relativity calculations play out together in a quite marvelous harmony within this structure. Besides the other two answers, general relativity does not have the uncertainty principle built-in. Insofar as the uncertainty principle is thought to be fundamental to the universe, general relativity is necessarily incomplete. By imitating general relativity and considering quantum field theory in curved space-time, gives only a first approximation to quantum gravity and does not solve the renormalization problem. It has been suggested that a more complete description of quantum gravity would involve quantizing space-time itself. My theory is that quantum mechanics lends itself better to university research grants. Looking at stars all day and scribbling on paper doesn’t get you those large dollars that building a supercollider does. So just the economics of the research favors quantum mechanics over general relativity.
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