Blacksix can you explane!

[flyingblind]

Perhaps someone can help me out here? Some lower end cards are only capable of running DX9 because of their limited design. However a card that can run DX10 or/and 11 can run DX9 very well. The developers are committed to getting DX9 working properly. Now, is this because they want DX9 only card owners to be able to run the game or is it because an important part of the game code is written for DX9 and it is too difficult or time consuming to rewrite this code as DX10?

Am I right in thinking that some of the game code is written as DX10 anyway and would this mean a DX9 user would have problems even if the DX9 parts were fully sorted. Dose this mean that all code in the game that takes advantage of DX10 card capabilities has to be duplicated as DX9 or is it just a fact of life that DX9 users will never be able to use CloD fully despite the developers best efforts?