If the cosmological constant (aka dark energy / vacuum energy) were zero, then an Omega greater than 1 would mean both positive curvature and a recollapse while an Omega less than 1 would mean both negative curvature and eternal expansion. This would make flatness (Omega = 1) very critical for the existence of large structures such as galaxies. But now that we believe the Omega for dark energy to be around 0.7, total Omega could be greater or less than 1 without causing recollapse. Wouldn't this make the "flatness problem" much less pressing?
I understand that dark energy density is independent of the scale factor and matter density changes as the inverse of the scale factor cubed, and that means that if total Omega were to deviate from 1 ever so slightly at the time of the Big Bang, we would not have a flat universe today, which we do. And I understand that that seems curious. But regardless, we could still have galaxies, couldn't we? In fact, wouldn't the expansion of the universe be slower if total Omega were greater than 1 (still assuming Omega_Lambda = 0.7), thus giving us even more time to form galaxies? Am I missing something?