What needs to be done to prevent snowballing:
Internal struggles for bigger factions
- having more lords is bigger power struggle, less loyalty, less obedience, etc
- OR having more fiefs per lord makes them more occupied with ruling them, or fiefs gain more authority
- like this, even IF snowballing occurs, there is a chance the faction might collapse or break up, which should be a mechanic
Other factions should focus on snowballing faction with some eu4-like aggressive expansion relationship modifier.