In short, Einstein created the model but wasn’t the one that plugged in the numbers to actually flesh out black holes. He thought about what would happen under those conditions, but he was one of those people who focused on practical matters and wasn’t convinced that black holes could exist.
Once his theory was tested to accurately explain and predict reality, people began to mess with it in all sorts of ways. Basically, turning dials on the equations to every manner of extremes.
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