Someone on CPF explained a while back that the original meaning of a BOB was something an emergency responder (paramedic or whatever) kept at home in case they got a call in the middle of the night. Its purpose was not to have supplies to get OUT of an emergency with, but rather to go INTO an emergency from the outside on short notice, to assist with rescue, repairs, etc.

For most folks at home, in most but obviously not all situations, staying put ("shelter in place") is the best strategy. Keep stuff on hand to get through whatever it is, and to help your neighbors. No need to add to the load on already strained emergency response crews, shelters, and so forth.