I will cover some reasons why the Einstein/Newtonian-gravitation-based cosmological models are disfavoured by the observational data with the remaining formal confidence in these models being 10^{-134}. This necessitates the development of new models. One such attempt is to use Milgromian gravitation and thus to avoid cold or warm dark matter being relevant. Results obtained in structure formation simulations will be touched upon, with a discussion of the viability or failures of this approach.