Cosmology primarily relies on general relativity, while quantum field theory (QFT) serves as a framework for developing various models, including those in curved spacetime. The basic properties and rules of QFT remain unchanged regardless of the cosmological model used, including the ΛCDM model. While cosmological models may incorporate quantum effects, they do not modify the fundamental aspects of QFT. The parameters in classical cosmological models can be informed by quantum predictions, but this does not equate to altering QFT itself. Therefore, different cosmological models must consider QFT predictions without modifying its core principles.