There are situations when a new person can join the party - for example, Gail or Laezel. And your party already has 4 members. Then there are strange dialogues, and a new character is waiting in the camp.
I think it would be much more convenient if Baldurs Gate took over the experience of Dragon Age Origin, and made a screen for selecting party members during such an event in order to avoid inconvenient dialogues (some players do not understand them and consider them a refusal to go with us) and take a new member into the party instead of someone from the current group immediately

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Thanks to Larian for Baldurs Gate 3 and the reaction to player feedback