A theory was considered correct if it could explain universal physical phenomena in reality, not every phenomenon in every field. Just like Classical Mechanics: it could not explain phenomena in the quantum realm, but it was still correct for phenomena in the Macro World.
For the various mechanical relationships involved in daily life, even calculations of planetary gravity, humanity still used Classical Mechanics equations. These things were the same whether on Earth or elsewhere in the universe.
The theories proposed by human scientists now were the same. They did not apply to the various mechanical relationships involved in daily life, but they did apply to environments such as the Black Hole Photon Sphere and the Event Horizon. Thus, in this regard, they were equally applicable to any black hole.
This was Cosmic Isotropy. No matter where one was in the universe, the physical rules were the same set. Naturally, artificially altered rules did not count. It was like how the Precursor's Rhomboid Crystal had told humanity that quantum entanglement could once be used for Hyperdistance Communication, but no longer could. That was the result of interference by some God-Level Civilization.
If the Precursor had not left behind that message, civilizations born later in the Milky Way Galaxy, or throughout the vast star regions near it, would never have known of this. Then, one day, when they embarked on The Great Voyage and reached regions where the rules of quantum entanglement might not have been altered, they would doubt the Spatial Isotropy Principle they had always believed to be correct.
And once that principle was overturned, that civilization's Cosmic View would undergo a drastic upheaval. It might cause the civilization to give up on itself, believing that exploring the unknown was futile and ultimately perish. Of course, it might also send