I think what this discussion has told us is, everyone plays the game how they want to play it. The best that Larian can do is make options available. I really don't like the idea of killing off characters after Act 1, but there might be a development reason for it.(resource logistics) If they made a setting at the start of the game as to how many party members you wanted, then all the encounters would be based off of that. If you want a 4 party team, great! The CR and number of creatures you encounter would be based off of that. If you wanted 5 or 6, then the CR scale would slide based off of that.