If we were to de-link capital requirements from risks and, therefore, potential losses, we would have to deal with unhealthy consequences. In a crisis there would not be sufficient capital to cover increasing risks and losses, as we would incentivise weak banks to take on high risks in pursuit of high returns.
Although I am convinced by the idea of making capital requirements more risk-sensitive, I acknowledge that estimating actual risk weights is very hard. Thus, it was very important to combine greater sensitivity with backstops. So, with Basel III we introduced the input and output floors, which will limit the influence of modelling choices.