And I also think the limit for the amount of saved up traits should be higher - 3.

Let's wait until we get more info on this from firaxis.

Unique benefits don't have to limit the player. For example, if the carthaginians get +1 attack for the War elephant unit, does that force the player to use war elephants? Of course not! it just means that if the player uses war elephants they will be a little stronger than the war elephants from other civs. Another example, if a civ gets -10% cost to research a particular tech, does it force the player to research the tech? NO! It just makes it easier if the player wants to.

I, for one, think that "unique benefits" can be a great idea, IF properly implemented. SMAC had unique factions and it worked great. The factions were more interesting to play and more interesting to interact with. Players developed new strategies for the each faction. And, with the editor, players were able to create their own factions!