The NTSB made 15 recommendations based on their TWA 800 findings, and many more in the years following. When Boeing dragged its feet on implementing them the FAA fined them $13 million. Link
I find that damning. A $13M fine?? Do you have any idea how large Boeing is?? They looked under the couch cushions in the executive lounge, found $13M and paid the fine.
This is called “going through the motions”. The NTSB pretends to get tough and serious. And Boeing pretends to feel enormous pain from a diddly little $13M fine. Everyone plays their part, and the “serious matter” of the center fuel tank is “dealt with”.
I think this is transparent Kabuki theater.