FSA Question-Economic Pension Expense

Just a general conceptual question. What information does Economic Pension Expense convey that Pension Expense (Service Cost+ Interest Cost- Expected Return on Plan Assets+ Amortized Loss(Less Gain) + Amortized Translation Underfunding(Less Overfunding)+Amortized Prior Service Cost+Curtailment/Settlement) does not convey?

Just paints a more accurate picture of actual results. For instance… do you think that expected returns and actual returns of investment portfolios were even close in 2008?