Why are humans so obsessed with projecting our mental abstractions we use to engineer and reason about physical reality into a be all end all theory of existence? Quite pretentious for some monkeys who just learned how to fly 4 generations ago.
Physicists are well aware that their knowledge is not complete. On the other hand, our theories seem to fit reality too well. Physicists are yearning for data that points at new phenomena that would force us to discard the old theories, like relativity and QM forced us in the past. Currently, there seems to be no further good avenue to breakthroughs than staring harder at our data and building bigger experiments and detectors, all the while hoping that the conditions revealing new physics are not magnitudes above what we can ever reproduce on Earth.
And the very same monkeys were quite pretentious to try to find a way to fly when God did not gave them wings.