As a result, those banks had an incentive to add risk rather than reduce risk in their portfolios because the capital cost of each additional asset was the same whether it was risky or safe, and the riskier assets would produce the higher return.
The proposed recalibration eliminates this incentive by returning this leverage ratio to a level that is a 1 / 10  BIS central bankers' speeches  backstop rather than the driver of decisions at the margin.