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This talk focuses on the comparison between the predictions of relativistic hydrodynamics and kinetic theory for flow observables in the context of heavy-ion collisions. While the two theories agree for systems which are close to equilibrium (after hydrodynamization), their far-from-equilibrium behaviours differ considerably (during preequilibrium). An analysis of the early-time Bjorken flow attractor in the two theories reveals that discrepancies during the (short) preequilibrium evolution leads to significant discrepancies in flow observables. As a workaround, we propose a rescaling of the initial conditions for hydrodynamics that compensate for the differences in the early-stage dynamics, which brings (ideal and viscous) hydrodynamics in agreement with kinetic theory provided that the equilibration time scale is shorter than the time scale associated to transverse expansion (typically the system size, R).