A simple skill check would have been better, i.e. strength->intimidation, charisma->charm, intelligence->reasoning or something.
Why even bother with charisma if you could use other skills to get what you want?
Because that would be closer to what the developers originally planned and similiar to what other developers have done. The game used to have 3 skills for intimidation, charm and reasoning BTW before it was ripped out.
