I think because of 5gb less space. DL HD DVD = 30gb, SL BD = 25GB. Even with VC-1 codec space is still an issue. AFAIK current movie releases on DL HD DVD are around 27 GB. In the end SL BD will hav espace issues even with advanced codecs. Move itself will be good, I certainly hope so, but not much for the extras.
On the other hand MS folks on AVS claim VC-1 codec is good enough to cram 4hours of quality HD video on 30GB, but I doubt that.
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