Having four factions on release could be an issue.
After coming from warhammer 3 it’s going to be a shock only having four factions in the game. I don’t even really mind only being able to play four factions. I’m really concerned about it from an enemy faction perspective. Like you’re going to only have 3 other factions you fight. Technically you’ll probably be able to fight your own faction but it’s hard to imagine that happening often. The orks will probably fight themselves more often but it’s hard to imagine Aeldari doing it frequently. That’s not even taking into account the imperial factions who will probably not be fighting each other often either. If you play space marines that will mean you will almost exclusively be fighting only two other factions. Each army will also be the least diverse till they get dlc.
I’m really hopeful they put out another faction shortly after launch to help with this. Maybe they’ll also make mini campaigns for things like the Badab war to have those imperial vs imperial fights more often and have orks and Aeldari as background enemies to fight for diversity.
Edit: To clarify I mean 4 races or whatever term they will use in this game. I assume there will be multiple sub factions per race.