The Importance of Corroboration

Karl Popper: Refutations are possible, but verification is literally impossible. Therefore, you can never in any way verify or confirm a theory. There are no positive arguments in favor of a theory, only negative arguments for competing theories. Once a theory has even a single counter observation, it is falsified. It doesn't make sense that the theory could improve or strengthen just because it survived tests that might have refuted it. Such tests do not change the nature quality of the theory itself. So it seems that Popper's corroboration really brings nothing to the table and it's a relic of his times.