Actually there is many games with high graphics where we can find over 500+ models and DETAILED environment (not SEA!) and its work good even on not best pc. Stop talking about fps, if we need to play cards with dx11 dont talk about power of PC.
I think its good idea. Implement more detalis to world makes our game better than others craps. Should be option for bad PC - if you have bad pc press button and hide crew on ships and other details(similar option was in silkroad game)
I want to see more crew, animals and animations like falling off from ship our crew if is storm.