I am recently back from a week on Emperor Elite and I have to say that Emperor had put lot of thought and effort into their safety systems.
Things that stood out to me were:
Everybody in a downstairs cabin being shown the emergency escape routes, and how the hatch opened. The crew later checked that people remembered the route.
A fire drill early in the week.
Two separate smoke alarm systems in the cabins, and there were lots of smoke alarms around the boat.
No charging allowed in the cabins. All the plug sockets had been removed from cabins to prevent anyone breaking this rule
A night watchman. He slept during the day and spent the night walking around all areas of the boat. He had to visit all the public areas every 15 minutes. He had to confirm his checks by scanning QR codes
Auto fire extinguishing balls in key places around the boat.
Fire blankets in cabins to help with escape in event of a fire.
Having been on about ten different Red Sea liveaboards I think this was the one with the most well thought out safety systems.