They probably won't raise it and I have no idea why its only 3 players. But it seems 3 is a design choice. 3 astronauts on mars, 3 classes and races. Idk of the 3 goes any deeper then that, but maybe it plays a significant role in the lore or something
English
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Bungie through years of play tests and found 3 was the best way to get each player to feel a powerful and meaningful part of the team