A common fault in RPGs. 
 
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Yeah, this really bugs me too.  It seems to me that the reason this always seems to happen is because: 
  
1. Later in the game, you have more options (more abilities), so it is easier to find a workaround to anything that would be difficult. 
  
2. The reward for a skilled player who completes side quests is to make the game easier!  The game essentially scales DOWN in difficulty when a skilled player plays. 
  
If I had it my way, completing sidequests and optional tasks would make the game harder, instead rewarding the player with either more storyline, hidden areas, or unlockables.  Eh, I don't know if that would really work, though. 
  
I thought Kreia was harder than Malak, but maybe that was because I was auto-levelling my character all game in KotOR2  in a vain attempt to make the game more difficult. 
 
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it couldnt then the final boss would be so powerful that you couldnt beat it.