Are there any benefits / scenarios where limping the BTN is a better strategic option than open raising?

When we limp the BTN in a HU scenario, BB gets to realize some of his equity in the pot with even the worst of holdings (72o, 83o etc.) that he would otherwise fold 100% of the time to a raise. Once BTN decides to limp and BB has bottom of range, he profits > -1BB even if he only continues when he flops superbly well.

I suppose there is merit to a BTN limping strategy when stacks are shallower or in HU tournament situations, but I can't seem to identify exactly why that would be the case.