One recurring RPG trick is to introduce a large cast, then let only a few characters join the active party. That limit can look like an old technical compromise, but modern games still use it because choosing who comes with you changes both combat and character rotation.
Baldur's Gate 3 is a clean example. PC Gamer notes that the game limits the active group to four characters, while extra companions remain at camp and can be swapped in. The first two Baldur's Gate games used parties of six, so the smaller active group in the third game is not simply an inherited rule from the series.
The interesting part is what a limited party does to player decisions.
Every slot has an opportunity cost
When only four characters can enter a fight, adding one role means leaving another outside the active group. A player may want strong direct damage, healing, battlefield control, stealth, conversation skills or utility, but there are fewer slots than possible jobs.
That does not mean every party needs a rigid "tank, healer, damage, support" formula. Baldur's Gate 3 is flexible enough for unusual combinations, and many characters can cover more than one function. The point is that the limit makes composition visible. Taking one companion is also a decision not to take someone else.
PC Gamer's coverage of party management has repeatedly highlighted the friction and the appeal of that choice. A later feature arguing for a mod that removes Baldur's Gate 3's party-size limit makes the trade-off especially clear: expanding the group lets players hear more companion dialogue and use more characters, but it also changes encounters that were balanced around a smaller active party.
That is useful evidence that the limit affects more than screen space.
The bench becomes part of the design
A limited active party also gives developers a reason to support a wider roster without making every battle include everyone. Baldur's Gate 3 keeps surplus companions at camp, allowing players to swap them between outings. That creates a rhythm where the "bench" remains part of the adventure rather than disappearing from the story completely.
The same idea appears across many party-based RPGs, although the exact numbers and motivations differ. Some games encourage rotation because characters have specialized abilities. Others make party choice primarily about personality, story or preferred tactics. It would be too broad to claim that every developer chooses a party cap for the same reason.
As an editorial design reading, however, the effect is consistent: scarcity makes the roster a choice. If every recruited character were always active, party composition would stop being a question.
That is why party limits remain interesting even on hardware that could obviously display more characters than an older console or PC. Technical constraints may have shaped early RPG conventions, but modern games can preserve the convention because it creates decisions that are useful in their own right.
The fun fact is not that four is a magical number. It is that a small active party turns companionship into strategy. Who comes with you changes the skills, conversations and combat options available now, while the characters left behind remain possibilities for the next trip.
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