Okey, lets see ...
1. Magic pockets. At some point in the prologue, probably in the first 2 chambers, a cutscene should show the MC finds a set of 4 magic pockets. These can be traded to new party members if they are swapped in. However, since there are only 4 pockets, it works best to only have 4 party members. The MC could even make a brief comment to that effect. If they do 6 characters, then 6 pockets, etc. If they start with 4 and upgrade to 6, MC finds more magic pockets.
This would be acceptable ...
2. A cutscene upon gaining your fifth party member. During this scene, the MC asks the new member to join. The new member then moves to join the others but the MC is the one to suggest that the party size might be now too big. "Perhaps a smaller group would be better," the MC states. "We might draw too much unwanted attention with more than 4 (or 6 depending).
This sounds like nonsence ...
You are after all heading to openly attack goblin base camp at one point, so more the better for sure.
Besides, we could use someone to stay and watch over the camp." Then another member like Astarion might say, "Oh! And maybe they could handle all the boring things for us, like fishing and gathering and cooking and cleaning. You know, the peasant tasks that unimportant people do." Then a party management window would pop up allowing you to choose who you want to keep in the party and who to send to camp.
This would never work ...
Our companions are too smug to accept such attitude, Lae'zel for example would after such comentary probably either leave, or cut his throat ...
3. Food, water, and camp maintenance. During the first night at camp, a quick tutorial could explain that anyone you leave at camp will spend their days finding food, water and taking care of other camp maintenance like cooking meals, etc. The more characters you have, the more food and water and camp maintenance will be needed to survive. Thus, a simple camp mechanic could be done where the player chooses which party members will join the quest and which will be assigned to camp duties. Camp duties would be gathering food and drink first, then equipment maintenance. If you don't leave enough people at camp to manage this, penalties start to occur.
Same reason as abowe ...
Can you honestly imagine Lae'zel, Astarion, or Shadowheart to bring food for everyone?
So 6 total members? 4 in party and 2 at camp satisfies the requirements. Prior to 6 members, 1 at camp satisfies the requirements. So kinda a 1 at camp for every 3 total members. Later, when you get even more members, maybe then increase party size to 6 with the MC stating it might be good to now take more members with. So 8 members total, 5 in party and 3 in camp meets the requirements. 10 members, 6 in party and 4 at camp. Prior to having a full party of 4, the player could still leave 1 at camp if they didn't want to worry about finding food, etc. or weapon maintenance for that day. Otherwise, they'd have to find food and fresh weapons or suffer penalties.
We still dont even know how many companions would we have in the end, so any numbers are kinda pointless ...
Also, in Multiplayer there is allways potentialy +3 ppl. :-/
The rest of the post seem to be pointless to react, since premise itself is rejected. :-/
