NTSB has produced a 6-page summary of their findings:
https://www.ntsb.gov/news/events/Documents/2020-DCA19MM047-BMG-abstract.pdf
It contains a summary of the events of that evening, a summary of the safety issues, the 18 "Findings" mentioned upthread, as well as their 9 recommendations to the US Coast Guard (stricter regulations re: interconnected smoke detectors, egress to multiple spaces, and egress obstructions), and 1 recommendation to Truth Aquatics: to "Implement a safety management system for your fleet to improve safety practicesand minimize risk."
Interestingly, these recommendations do not cover the ignition sources themselves, nor the combustibility of materials such as seating. I agree with Ken that there is much to be said there for this case and others like it, but the NTSB has no recommendations on those matters at this time.
Not being a mariner, I have never heard of a Safety Management System (SMS). From the recording, it seems to basically be a way to log the roving patrol's movements throughout the boat over the course of the night. Having a log will empower the USCG to enforce this law, which today is essentially unenforcible. Do I have that right, or does an SMS refer to something else? Hopefully a proper mariner can chime in here.