In recent years, a significant part of the banking system in several countries has been kept alive by public capital injections and state guarantees, plus the liquidity support of the ECB. Most banks were no longer masters of their destiny. In hindsight, many of them generated instability and became part of the problem. Now, we need them to be active parts of the solution.
Hence, a Resolution Authority that is only a coordinating mechanism for existing national authorities is not sufficient.