Fallen Earth wasteland for a while, you're probably familiar with their mechanical interplay by now. The game really rewards you, of course, for playing the field rather than picking one faction as your specific allies. But that's all going to change. As outlined in the latest developer blog, starting with the next major patch, players will be expected to choose one faction as their "core" faction to participate in Territory Control and Conflict Towns.
This might seem like a bit of a downgrade, but it comes with the advantage that the developers are also doing away with shoulder factions, meaning that each factional pairing works as an unlinked two-way street. Fighting for one faction only loses standing for the opposing faction, not for other allied factions. Choosing a "main" faction is also not a requirement for several other faction features in the game, just the direct war between the various groups. Still, it's going to be a major update for the game's systems, forcing players to really decide who they want as an ally in the long run.