@Grimjoww08 I think it has to do with three things:
1) No matter how accurate the pen and paper rules conversion to a computer game may be, it will never be perfect. It will lack two essential things: The human factor and the ability to improvise. A computer game simply needs fixed rules to follow.
2) Every player has (sometimes not so hidden) need to be a special snowflake. (Due to my promise to a certain unnamed queen, I will skip the long lecture about the word starting with "W".) Just like in the normal world, the laws of logic and physics exist in the fantasy world.
Your race simply carries certain baggage, both negative and positive. You can stand against your nature, but you will never overcome it. It's not that there aren't exceptions, but specifically your character will always start out as a normal member of their race. In BG2, we were half-god, yet we started out as completely normal members of our race. You have to work your way up to being unique, you can't start with it. Even Drizzt was an ordinary Drow at first.
3) Many players prefer when they can rely on the unchanging rules they know. This is especially true for people who have a lot of experience with world of D&D and maybe even read some novels. If you know how the world works, it's incredibly irritating when someone tries to change established rules that make complete sense.
