This other thread got me reading about metric expansion and this graph: https://en.wikipedia.org/wiki/Metric_expansion_of_space#/media/File:Universe.svg I am possibly misreading the graph, but it seems to suggest that, if we are in an expanding universe (large dotted line), and curvature is currently zero, then its expansion was decelerating in the past (as presumably, it would under the sole influence of gravity). But this means that we are in (or at least, near) a unique time it the universe, when curvature is crossing from negative to positive. Does this not go against the Principle of Mediocrity? Sure, it is usually applied to observers in space, but can it not equally apply to observers in time? Are we just lucky to be at the one unique point in the universe's evolution where we see two opposing phenomena in near balance on a cosmic scale?