Great Point of view but I am perplexed by your thought process. There are evidences of massive gravitational singularity in space and the record of gravitational wave by LIGO . What about those if Blackhole is a mathematical blunder and space do not curve. The bending of light is due to gravitational lensing which is how most people interpret. Though your logic seems viable it might lack the mathematical foundation that is core to scientific understanding of universe. Einstein said it was a blunder but he never said that it can not exist. What about his blunder of putting a constant in his equation that satisfies universe and now relates to dark matter.