Hatmatter
Laws of Mordenkainen, Elminster, & Fistandantilus
Do you have any logical argument to support that statement? Why do you think it's better if there are multiple ways to model the same character concept, rather than just one?
Variety, for one. Each different model will have a different emphasis or flavor into which a player may lean when role-playing. I am not seeing the problem here. It is a fun game as is, why are we wanting to change it...so that there is only one possible way to create a Drizzit character? And, in exchange for that hypothetical situation, we have many players who miss having a ranger class? Or a paladin class? Or a barbarian class? I think the game seems to be pretty fun for those who like to play D&D and, the beauty of the game is that homebrewing it is quite easy. So, any DM who cares to (at least in a private game at home) can disallow classes if he or she is so inclined.