The Swiss government (Bundesrat) commissioned a study on banking reform, including bank separation, by a team led by Prof. Manuel Ammann from St. Gallen University. (That’s like asking the landlord whether his wine is good. You already know what answer you are going to get, and how the wine is going to taste.) Ammann is an expert in derivative instruments, asset management, financial markets and risk management. Predictably, the study rejects bank separation, including with the fake argument that the risk of bank failures would be higher:

(https://www.nzz.ch/wirtschaft/hsg-gutachten-die-verstaatlichung-soll-bei-einer-krise-der-neuen-ubs-eine-offizielle-option-sein-ld.1741587)