People keep saying that, but they never stop to think what it would actually mean to make an option out of something.
The more options which are added, the more difficult it is to balance them properly. This is especially true for a game such as this with a completely flexible set of races and classes as the party. The amount of permutations quickly spirals into a range which makes it literally impossible to test. For proper balance, there needs to be a baseline of solid mechanics, not a bed of shifting sand.