Ah the conspiracy theorists are out in numbers today.
TWA 800 caused a massive change in the way aircraft are designed, maintained and operated. The NGS inerting systems are mandatory on all new designs. Not just in the centre tank either. OK it has a Cat D MEL limit which makes you think it's not really necessary, but it's a heavy and expensive sytem. Somehow I don't think it is there just for show.
Critical Design Control Configuration Limitations (CDCCL). SFAR88 etc cost airlines a lot of time and money. Again, not just for show.