@Kesa
Probably for the same reason people say "Peg" instead of Pegasos, "A1" instead of "amigaone" and "Sam" instead of "Samantha": It's shorter and easier to write!
There is no need to "trivialize" the the A1X1K, no need for conspiracy theories; its prohibitively high price, its crappy price/performance ratio and OS4's substandard features/performance will ensure it will never become more than a parenthesis even in the OS4 branch of NG OS's...