Why do you believe that our current understanding of physics is the final one?
Let me propose a thought experiment. Let’s just say for the sake of argument that humanity has survived 100,000 years into the future. Now, let’s put you in a time machine and fast forward you to that distant future.
Would you be surprised to learn that relativity, and the limits it imposes, are viewed by those future humans as anachronistic and silly? Barely remembered artifacts of humanity’s Stupid Ages? That new discoveries were made over those thousand centuries, discoveries that we 21st century humans can only vaguely begin to comprehend?
Because you raised my biggest problem with modern cosmology: it’s arrogant assumption that Einstein is the end. But more importantly, that evidence indicating that relativity is not in fact the end — such as UAPs — is completely disregarded.
And the reason it is disregarded? Because relativity is the end! It’s circular reasoning at its absolute worst.