No one "missed" black holes. There are obvious degenerate singularities that appear when you take a simple exact solution like the Schwarzchild solution past se

No one "missed" black holes. There are obvious degenerate singularities that appear when you take a simple exact solution like the Schwarzchild solution past sensible physical reality by e.g. pretending conveniences like "point masses" really exist. It took decades of theoretical development to show that black holes were actually possible, and it was still very surprising that they turned out to observably exist.