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Good wikipedia article on these types of cosmologies including timescape cosmology: https://en.wikipedia.org/wiki/Inhomogeneous_cosmology https://en.wikipedia.

• numpy-thagoras 2y ago
  Many advancements in science have happened because we stopped for a second, and then looked to generalize our assumptions. Consider, e.g. Euclidean geometry -> non-euclidean geometry; Classical analysis -> nonstandard analysis; Linearity -> non-linearity; Homogeneity -> inhomogeneity; Flat spacetime -> curved spacetime; Singular probabilities -> superposition. All of these were loosening of certain criteria that opened up many possibilities. It is certainly erroneous to assume we must, by necessity, have a homogeneous cosmology.