Even the thread title is misleading. Scientists have discarded one theory in favour of another, but that's because evidence has emerged that has decisively, and objectively, shown that one is a better description of the available evidence. The part that remains constant is the requirement for objective evidence, the method. On *that* there has been no changing of minds. It's not a question of ego, or of hubris. The new evidence instantly refines and redefines the subject because that is how it is supposed to work.
In as much as there was any change in policy, it was merely that posts in the Science category should be more mindful of *how* an opinion is reached, and to stop promoting a false equivalence between theories with objective evidence and opinions without.