But mortality credits (pooling) don't solve the math of the discount rate - they add 100 - 150 basis points of reduction so retarget to 5.5% vs 4% if generous
So they are still structurally designed where they HAVE to allocate towards risk to meet their targets which is at core of issue
But that does not justify the numbers we actually see being used.
The Pension Protection Act of 2006 mandates that non taxpayer funded defined benefit pension plans use discount rates from high grade corporate bond yield curves, which are much lower.
https://www.irs.gov/retirement-plans/pension-plan-funding-se...
Even some non taxpayer funded defined benefit pension plans are more privy than others, depending on the political power of their beneficiaries.