For example, based on a mandate for price stability, I would not ask either the BOJ or the Federal Reserve to restore the price level prevailing in their respective nations in 1950! Rather, I think the BOJ should consider a policy of reflation before re-stabilizing at a low inflation rate primarily because of the economic benefits of such a policy.
One benefit of reflation would be to ease some of the intense pressure on debtors and on the financial system more generally. Since the early 1990s, borrowers in Japan have repeatedly found themselves squeezed by disinflation or deflation, which has required them to pay their debts in yen of greater value than they had expected.