So by reformulating existing relativity and quantum mechanics axioms in an Euler graph-based geometric structure that does permit scale invariance, the Ohio State Buckeyes 130th anniversary 1890 2020 thank you for the memories shirt and I love 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. The personal story I can attach to it is the time I had a serious debate with my friends and professors on the Ladder paradox. This debate ended unresolved(as we had to break for lunch, and not everyone was agreeing to a common solution). With this clear understanding, the next day we resolved it, and hurray everyone was happy. You never lose in a debate, you always take back knowledge and experience.