Both GR and QFT are insanely accurate models, but they are just models.
The N-body problem is undecidable, and Gödel, Turing, Church and other s proved that is the best we can do.
https://philsci-archive.pitt.edu/13175/1/parker2003.pdf
Western reductionism or Laplacian determinism is a good framework for practical, computable models. QFT actually is actually one of the counterexamples to Western reductionism.
But models are reductive and scientific models are just models. Don't confuse the map for the territory.
All models are wrong, some are useful; is another way of saying the same thing.