Reason behind texture import default settings?

The default texture importer parameters are Bilinear filterung and Aniso Level 1. These values are also used by all the textures in the Bootcamp demo. Bilinear filtering is faster than trilinear, but produces visible seams. Aniso Level 1 is slower than 0, but produces sharper results in the distance.

To me this seems like an odd combination in comparison to trilinear and aniso 0. Why would you want to prefer this particular combination? I miss the point in producing sharper, visible seams. Can someone enlighten me please?

This is not an answer to your question, but you could use AssetPostprocessor.OnPostprocessTexture and TextureImporter to overwrite the default settings.