If they want people to dress in period clothing, which will of course add to the cost of your cruise, are they going to re-enact the sinking too ? Now THAT, would be realism !
I don't mean actually sink the ship, that would be dumb. But have everyone get into the lifeboats, get lowered into the ocean and pull away about 100 yards. Then, turn off all the lights on the ship. And stay out there for about a half hour.
If you think that sound like an amazing idea............
...............you're an idiot !