The answer is simple. Because none of the available Linux-images no support for eMMC, WiFi / BT, GLAN. I bought the board mainly due to Linux and I am very disappointed. Even the best board is without software support useless.
Android Is there much better, support eMMC, WiFi / BT, GLAN, but the latest version not support NTFS and ExtFat file formats, as a media player useless.