25% is a large enough percentage to warrant the exclusion of such a late addition to the game engine. It could very well end in a train wreck if it was attempted and I think Bethesda is smart enough not to risk a 10-15% hit in sales from borking the PC version with unneeded.
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Many people wrote it here but I want to do it again:
DirectX 11 has nothing to do with better graphics. Its damn easy to implement. In fact, its just a few new lines of code.
DirectX includes a language to speak with the graphics card (and other languages for the keyboard, mouse, sound, ...).
DX9 also included a language, but a simple one.
Now with DX11 you can talk to the DX11-graphics-card in a simple, DX9-way or in a complex, DX11 way.
So its absolutely possible to add DX11 support and have the same visuals as in DX9.
DX9 is at its limits. DX11 not. And a completely new engine, that maybe should be implemented in future Bethesda games, will be at least prepared to support DX11.
Maybe we won't see DX11 in Skyrim, but sure as hell the Creation Engine is prepared to support it.
The main problem why they may not implement it, is that most gamers want to see better graphics in a game labeled with "DirectX11 compatible".
And Bethesda may not implement much better shaders only for the pc version. But they could at least implement DX11 so that the fanbase can spice up the shaders and add new ones.