I was on the dawn last December in Dubai. I really liked the ship because it's small!
I liked going to the same bar every night talking to the same bartender and same guests.
I didn't visit any show so I can't talk on that.
I did FAS plus, mainly for extra dining and some nicer cocktails and Starbucks.
I felt it was worth it, as a solo traveller.
Can't speak for duo traveller because you get the extra excursion credit.
If you are not into big ships like me, you shall enjoy! (Why did I book ncl epic for winter 2025 lol)