No! Empire and Kingdom should be the only hard playstyle difference. Races should get bonuses and penalties and look very different in a biped sort of way. You should be able to choose any race or nation and be able to choose form the 5 ways to win and the 100 strategic playstyles to get there. I don't want to see the Resoln and say, "Guess that means I need to counter a heavy armor army with little magic." Typifying races and nations with a specific playstyle will actually make the game boring and predictable like Starcraft. Each new game needs new tactics.
And okay, if we could get more than 6 playstyles with unique buildings and strategies, that would be cool. I just don't think its smart to try unless we are talking about Elemental: Twilight of the Titans (Elemental expansion 2). TotA from GalCiv2 was well made because it had a great game to build from. FE needs to build an awesome core game before such lofty ideas can be designed.
Lofty Ideas? Different playstyles is a main stay of all strategy games.
Apparently you haven't played Starcraft too much because that game is so indepth with strategy it isn't even funny. I mean there are the core strategies but each have little side strategies and specializations. I want a race that I can go into and say, hey theses stats lend to an early game builder, but a late game war monger or a race that is like an early game explosion and keeps that momentum the entire game.