in HoI3 you had more than 3 parties and what did you gain? nothing in terms of gameplay only some names for flavour. The only thing that matters is the % distribution between the three major political factions that make up the opposing ideologies in the game, that is what makes a difference in the game. If denmark had 6 parties. 1 for facist, 4 for democratic and 1 communist you would just have to sum up the democratic parties if you wanted to know the % pie size of the democratic faction size in the country. Also you would need a mechanic and processing for finding a distribution of % votes for all the parties which in fact was just ghosts because the only thing that matter anyway is the sum of parties in the facist, democratic and communist faction.