Yeah but 4100 passenger berths on a ship this size is getting close to Norwegian Epic crowding.
The key word is consolidation from now on - Princess and NCL are doing it. too. More passengers per ship = more efficiency.
Doesn't mean it won't be a nice ship, though. let me put it this way, I would rather sail on this new ship than Norwegoan Epic (about the same passenger/space ratio) but Norwegian Epic is ugly and crowded.
If anything, RCL has really learned how to build beautiful and utile ships. If anyone can handle crowding it is RCL - they are very good at crowd flow.